Your magic comes from demon nobility that mingled with your ancestors. Most often, sorcerers with this origin trace their descent back to the Ars Goetia. Most of these bloodlines are well-known in Hell, but some are obscure. Any sorcerer could be the first of a new bloodline because of a Soul Contract or another reason.
Origin Spells
Thanks to your links to the Ars Goetia, you have access to spells generally associated with the Warlock class. When your Spellcasting feature lets you learn a sorcerer cantrip or a spell of 1st level or higher, you can choose the new spell from the warlock or sorcerer spell lists. However, the initial cantrip and spell you learn depends on your alignment. For example, if you are Lawful Evil, you pick between True Strike and Protection from Evil and Good or Chill Touch and Hellish Rebuke.
Lawful: True Strike and Protection from Evil and Good
Chaotic: Minor Illusion and Hex
Good: Green-Flame Blade and Healing Elixir (Unearthed Arcana)
Evil: Chill Touch and Hellish Rebuke
Neutral: Eldritch Blast and Witch Bolt
Goetic Endurance
Starting at 1st level, you are resistant to radiant damage.
Demonic Intervention
Starting at 6th level, you can call upon your Goetic power to have the odds in your favor. This allows you to add 1d6 to any skill check or saving throw you fail. Once you use it, it cannot be used again until you take a long rest.
Demon Form
Starting at level 14, you can call upon your Goetic power to assume a more demonic form. In this form, you sprout wings, allowing you to fly at a speed equal to your walking speed. Also, you have advantage on spell checks and are resistant to spells up to 5th level. However, your demonic form weakens you, making you take 1d6 necrotic damage on your turn. Your demonic form lasts for 5 minutes or if you exit as a bonus action. Once you leave this form, you gain 1 level of exhaustion, and you cannot use it again until you take a long rest.
Infernal Recovery
At 18th level, you can recover from a severe injury. When you have less than half of your health left, you can regain half of your maximum health as a bonus action once per long rest.
Cherubs are purportedly tasked with protecting the lives of living, endangered, or suicidal humans, showering them with love to give them a reason to continue to live. These tasks are suggested to be done at the request of the deceased souls residing in Heaven, who want them to live whether they knew them personally or out of gratitude for helping them while alive.
Eyes: Your eyes are any pastel color of your choice.
Hair: Your hair is any color of your choice.
Skin: Your skin is any color of your choice.
Other: Base your appearance on either any animal of your choice or a young child. Also, your halo is white. Lastly, your wings' design and color are up to you.
Creature Type: You are a Celestial
Size: You are Small
Speed: Your walking speed is 30 feet.
Languages: You can speak, write, and understand Common and Celestial
Alignments: Cherubs tend to be Good, but there are exceptions
Age: Cherubs mature in their late teens and typically live into their 70s
Stats: +2 Charisma and +1 Wisdom
Fury of the Small: When you damage a creature with an attack or a spell and the creature's size is larger than yours, you can cause the attack or spell to deal extra damage to the creature. The additional damage equals your level. Once you use this trait, you can't use it again until you finish a short or long rest.
Darkvision: You can see in dim light within 60 feet of you as if it were bright light and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray.
Flight: Your flying speed is equal to your walking speed.
Exorcists are Angels who make up Heaven’s military to kill as many Sinners as possible, both to manage Hell's overpopulation and to prevent any potential uprising against Heaven.
Eyes: Your eyes are yellow with a white or pink sclera.
Hair: Your hair is white or any shade of gray.
Skin: Your skin is white or any shade of gray.
Other: Your halo is black, and your wings are white with black or gray stripes.
Note on Gender: If you play an Exorcist, you must play a girl.
Creature Type: You are a Celestial
Size: You are Medium
Speed: Your walking speed is 30 feet.
Languages: You can speak, write, and understand Common and Celestial
Alignments: Exorcists tend to be Lawful, but there are exceptions
Age: Exorcists mature in their late teens and cannot die of natural causes
Stats: +2 Strength and +1 Constitution
Angelic Endurance: You are resistant to necrotic damage but vulnerable to radiant damage.
Exorcist Training: You are proficient with longswords, spears, battleaxes, shortbows, and longbows.
Flight: Your flying speed is equal to your walking speed.
Exterminator: You have disadvantage on Persuasion checks on Cannibals and Sinners, but you have an advantage on Intimidation checks.
Cannibals are demons that were once human and ate other people for one reason or another before they died, which results in them being damned to Hell as their punishment in the afterlife.
Eyes: Your eyes are completely black.
Hair: Your hair is either white, blonde, brown, black, or orange.
Skin: Your skin is either white or light gray.
Creature Type: You are Humanoid
Size: You are Medium
Speed: Your walking speed is 30 feet
Languages: You can speak, write, and understand Common and Abyssal
Alignment: Cannibals tend to be Lawful, but there are exceptions
Age: Cannibals don’t age after they are sent to Hell
Stats: +2 constitution and +1 Wisdom
Infernal Endurance: You are resistant to necrotic and poison damage but are vulnerable to radiant damage.
Cannibalism: If you eat demonic flesh, you gain 1d12 health back. However, if you eat angelic flesh, you take 1d12 radiant damage.
Overlord: At 10th level, you gain the Eldritch Adept feat.
Sinners are demons that were once human and committed sins before they died, which results in them being damned to Hell as their punishment in the afterlife.
Eye(s): Your eyes can be any color.
Hair: Your hair can be any color.
Skin: Your skin is any color.
Other: Your appearance is based on what you did to be sent to Hell and how you died.
Creature Type: You are Humanoid
Size: You are Medium
Speed: Your walking speed is 30 feet
Languages: You can speak, write, and understand Common and Abyssal
Alignment: Sinners tend to be Evil, but there are exceptions
Age: Sinners don’t age after they are sent to Hell
Stats: +2 constitution and +1 a stat of your choice
Infernal Endurance: You are resistant to necrotic and poison damage but are vulnerable to radiant damage.
Versatility: Talk to the GM to pick an appropriate and balanced one for your character.
Overlord: At 10th level, you gain the Eldritch Adept feat.
Native to the Sloth Ring, Baphomets are demonic goat-like entities distinguishable by their digitigrade legs with hooves for feet, goat-like facial structure, and a candle-like horn that emits flames above their forehead.
Eyes: Your eyes are any color.
Hair: Your hair is any color
Skin: Your skin is any color.
Other: Your horns and candle are any color, and the flame is any color.
Creature Type: You are a Fiend
Size: You are Medium.
Speed: Your walking speed is 30 feet
Languages: You can speak, write, and understand Common and Abyssal.
Alignments: Baphomets tend to be Neutral, but there are exceptions.
Age: Baphomets mature in their late teens and typically live into their 70s.
Stats: +2 Wisdom and +1 Dexterity.
Bioluminescence: You emit bright light for 20 feet and dim light for 40 feet.
Healer: You have proficiency in Medicine.
Eldritch are squid-like demons that are usually (but not always) part of the von Eldritch family.
Eyes: Your eyes can be lime with a red or dark green sclera or completely lime.
Hair: Your hair is either dark green or white with black spots in the front.
Skin: Your skin is green or any shade of gray.
Other: Your teeth are lime.
Creature Type: You are a Fiend
Size: You are Medium
Speed: Your walking speed is 30 feet
Languages: You can speak, write, and understand Common and Eldritch
Alignments: Eldritch tend to be Lawful, but there are exceptions
Age: Eldritch’s mature in their late teens and cannot die of natural causes
Stats: +2 Wisdom and +1 Charisma
Amphibious: You can breathe air and water
Manipulator: You have proficiency in deception.
Telepathy: You can speak telepathically to any creature you can see within 30 feet of you. You don't need to share a language with the creature for it to understand your telepathic utterances, but the creature must be able to understand at least one language.
Eldritch Magic: You can cast Eldritch Blast at will. Wisdom is your spellcasting ability for this spell.
The Ars Goetia are bird-like demons of royal blood. Unless they are exiled, they are seldom adventurers because most of them (but not all) look down on other lower-class demons, particularly Imps and Hellhounds.
Eyes: Your sclera is any color of your choice, and your pupils are white.
Hair: Your hair is any color of your choice.
Skin: Your skin is any color of your choice.
Other: Your appearance is based on any bird of your choice.
Creature Type: You are a Fiend
Size: You are Medium
Speed: Your walking speed is 30 feet.
Languages: You can speak, write, and understand Common and Goetic
Alignments: Goetias tend to be Lawful, but there are exceptions
Age: Goetias mature in their late teens and cannot die of natural causes
Stats: +2 Intelligence and +1 Wisdom.
Goetic Lore: You have proficiency in Arcana and one other Intelligence or Wisdom-related skill.
Goetic Magic: You have two cantrips of your choice and one 1st-level spell that you can use once per short or long rest. At level 5, you can cast the Goetia Spell you picked at will. None of these count toward cantrip and spell limits. Intelligence is your spellcasting ability for these spells.
Darkvision: You can see in dim light within 60 feet of you as if it were bright light and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray.
Hellborn Hybrids are demons that have two birth parents who are not the same species.
Eyes: Your eye color is any color of your choice.
Hair: Your hair color is any color of your choice.
Skin: Your skin is any color of your choice.
Other: base your appearance on your parents. For example, if one of your parents is a Baphomet, give them a candle on their head.
Creature Type: You are a Fiend
Size: You are Small or Medium
Speed: Your walking speed is 30 feet
Languages: You can speak, write, and understand Common and one language of your choice.
Alignment: Hybrids tend toward no particular alignment. The best and worst are found among them.
Age: Hybrids mature in their late teens and typically live into their 70s
Stats: +2 for any stat and +1 for any stat, or +3 for any stat, or +1 for three of your stats
Mixed Genetics: Pick one racial trait for each of your parents (Cannibals and Sinners cannot be your parents).
Native to the Gluttony Ring, Hellhounds are in the lowest-ranking tier of Hell's hierarchy system, along with Imps. Because of this, most of them are used for labor or work. Because of their innate strength, they are sought after as bodyguards, and mercenary Hellhounds are a common sight.
Eyes: Your eyes are white with a red sclera.
Hair: Your hair is any color of your choice.
Skin: Your skin is any color of your choice.
Other: Base your appearance on any dog or wolf breed.
Creature Type: You are a Fiend
Size: You are Medium
Speed: Your walking speed is 30 feet
Languages: You can speak, write, and understand Common and Abyssal
Alignments: Hellhounds tend to be Chaotic, but there are exceptions
Age: Hellhounds mature in their late teens and typically live into their 70s
Stats: +2 Dexterity and +1 Strength.
Natural Tracker: You have proficiency with the Survival skill.
Darkvision: You can see in dim light within 60 feet of you as if it were bright light and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray.
Shifter: You can cast Disguise Self once per long rest. Wisdom is your spellcasting ability for this spell
Lycanthrope: You can turn into a Dire Wolf once per long rest.
Native to the Wrath Ring, Imps are the "proletariat" of Hell's society. They are the lowest in Hell's hierarchy, alongside Hellhounds, and are the least respected and most likely to be hired for heavy labor work or as servants for other demons.
Eyes: Your eye color is either yellow with black irises or yellow with red eyes.
Hair: Your hair is either black or white.
Skin: Your skin is any shade of red.
Other: Your horns depend on your gender. If you are a boy, your horns are back and white, but if you are a girl, they are black.
Creature Type: You are a Fiend
Size: You are Small or Medium
Speed: Your walking speed is 30 feet.
Languages: You can speak, write, and understand Common and Abyssal
Alignment: Imps tend to be Chaotic, but there are exceptions.
Age: Imps mature in their late teens and typically live into their 70s.
Stats: +2 Dexterity and +1 Strength
Pyrokinesis: You can cast Fire Bolt and Control Flames at will. Wisdom is your spellcasting ability for this spell.
Fury of the Small: When you damage a creature with an attack or a spell and the creature's size is larger than yours, you can cause the attack or spell to deal extra damage to the creature. The extra damage equals your level. Once you use this trait, you can't use it again until you finish a short or long rest.
Native to the Envy Ring, Infestors are eel-like demons that have the power to take control of another person's body.
Eyes: Your eye color is yellow.
Hair: Your hair is either silver or light green.
Skin: Your skin is any shade of gray or turquoise.
Other: Your appearance is based on any eel of your choice.
Creature Type: You are a Fiend
Size: You are Medium
Speed: Your walking speed is 30 feet
Languages: You can speak, write, and understand Common and Abyssal.
Alignment: Infestors tend to be Evil, but there are exceptions
Age: Infestors mature in their late teens and typically live into their 70s
Stats: +2 Charisma and +1 Wisdom.
Manipulator: You have proficiency in deception.
Shifter: You can cast Disguise Self once per long rest. Charisma is your spellcasting ability for this spell.
Possession: You can cast Charm Person once per short or long rest. At level 5, you can cast this at will. At level 9, you can cast Dominate Person once per long rest; at level 15, you can cast this spell at will. Wisdom is your spellcasting ability for these spells.
Amphibious: You can breathe air and water.
Native to the Greed Ring, Loan Sharks are shark-like demons that can often be found working as mobsters' enforcers.
Eyes: Your eye color is any shade of green.
Hair: Your hair is either dark green or dark navy blue.
Skin: Your skin is any shade of gray, green, or tan.
Other: Your appearance is based on any shark of your choice.
Creature Type: You are a Fiend
Size: You are Medium
Speed: Your walking speed is 30 feet.
Languages: You can speak, write, and understand Common and Abyssal.
Alignment: Loan Sharks tend to be Lawful, but there are exceptions
Age: Loan Sharks mature in their late teens and typically live into their 70s
Stats: +2 Dexterity and +1 Charisma
Darkvision: You can see in dim light within 60 feet of you as if it were bright light and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray.
Amphibious: You can breathe air and water.
Nephilim are the offspring of a high-ranking angel. They are typically affiliated with the Morningstar Royal Family, but some exceptions exist.
Eyes: Your iris is either purple, red, or violet. Your sclera is either gray or yellow.
Hair: Your hair is any shade of blonde or white.
Skin: Your skin is either white, light purple, or light pink.
Creature Type: You are a Feind
Size: You are Medium
Speed: Your walking speed is 30 feet.
Languages: You can speak, write, and understand Common and Celestial or Infernal
Alignments: Nephilims tend to be Neutral, but there are exceptions
Age: Nephilims cannot die of natural causes, and they mature at different times depending on what type of angel one of their parents is.
Stats: +2 Charisma
Angelic Lineage: You are proficient with Religion, and you gain resistance to necrotic damage.
Exorcist Nephilim
Age: Exorcist Nephilims mature in their late teens.
Stats: +1 Strength
Exorcist Training: You are proficient with longswords, spears, battleaxes, shortbows, and longbows.
Adrenaline Rush: Once per long rest, you can make two extra attacks on your turn.
Age: Seraph Nephilims mature at 150 years old.
Stats: +1 Intelligence
Holy Lineage: You can cast two Cleric cantrips at will and one 1st level Paladin spell once per long rest. At 5th level, you can cast your Paladin spell at will. Charisma is your spellcasting ability for these spells.
Flight: Your flying speed is equal to your walking speed.
Demonic Rage: Starting at 10th level, you can take on a more demonic form. In this form, you have the following abilities:
Advantage on Intelligence checks and saving throws.
When you cast a spell using Intelligence, you add 1/2 of your level to your spell bonus.
You are resistant to bludgeoning, piercing, and slashing damage.
Your demonic form lasts for 1 minute. It ends early if you are knocked unconscious or if your turn ends and you haven't attacked a hostile creature since your last turn or taken damage since then. You can also end your turn back on your turn as a bonus action. Once you leave your demonic form, you cannot reenter it until you take a long rest.
Native to the Envy Ring, Possessors are fish-like demons with the ability to manipulate water.
Eyes: Your sclera is pastel blue or black, and your iris is blue or white.
Hair: Your hair is any shade of blue or white.
Skin: Your skin is any shade of blue, purple, or silver.
Other: Base your appearance on any fish of your choice.
Creature Type: You are a Fiend
Size: You are Medium
Speed: Your walking speed is 30 feet
Languages: You can speak, write, and understand Common and Abyssal.
Alignment: Possessors tend to be Chaotic, but there are exceptions
Age: Possessors mature in their late teens and typically live into their 70s
Stats: +2 Charisma and +1 Dexterity
Darkvision: You can see in dim light within 60 feet of you as if it were bright light and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray.
Amphibious: You can breathe air and water.
Aquatic Magic: You can cast Shape Water at will and Create or Destroy Water once per long rest. Charisma is your spellcasting ability for these spells.
Native to the Lust Ring, Succubi have the second lowest ranking in Hell's hierarchy, along with most Hellborn Demons. They are known to have sexually intensifying abilities to others.
Eyes: Your sclera is yellow, and your iris is either red or pink.
Hair: Your hair is either brown, black, grey, pink, or blonde.
Skin: Your skin is either pink or red.
Creature Type: You are a Fiend
Size: You are Medium
Speed: Your walking speed is 30 feet
Languages: You can speak, write, and understand Common and Abyssal
Alignment: Succubi tend to be Chaotic, but there are exceptions
Age: Succubi mature in their late teens and typically live into their 70s
Stats: +2 Charisma and +1 Dexterity
Erokinesis: You can cast Charm Person once per long rest, and you are proficient in Persuasion.
Shifter: You can cast Disguise Self once per long rest. Charisma is your spellcasting ability for this and Charm Person.
Flight: Your flying speed is equal to your walking speed.