All Spellcasters

• Verbal component of spells is flavored as saying the name of the spell, in any language or order for the duration. Fireball can be Llaberif, or Narlab in elvish or if you reflavor it to be ice damage, calling the spell Icebomb. For rituals, it is enchanting the same word for the duration. This is for flavor. If you thought of something else, tell it to the DM. 
• The somatic component of spells are the intricate hand/s movements or arcane focus movement that facilitates the manifestation of the spell. With this, a visual of arcane circles, sigils or runes are seen (Kinda like in Dr. Strange).
• Main casters get the Cantrip sub feature at level 1:

• Artificer - Mending
• Bard - Friends or Minor Illusion or Thaumaturgy
• Cleric - Thaumaturgy
• Druid - Druidcraft
• Sorcerer - Prestidigitation
• Warlock - Eldritch Blast
• Wizard - Prestidigitation

Two-Weapon FIghting Defined

• Rule: Two-Weapon Fighting

  • Replaces the rules for Two-weapon Fighting in the PHB
  • When you take the Attack action and make an attack with a light melee weapon that you're holding in one hand, you can use a bonus action to attack with a different light melee weapon that you're holding in the other hand. The attack you make as a bonus action using these rules is called an off-hand attack, and the attack uses your off-hand weapon. You don't add your ability modifier to the damage of the offhand attack, unless that modifier is negative.

• Fighting Style: Two-Weapon Fighting

  • When you engage in two-weapon fighting, you can add your ability modifier to the damage of off-hand attacks.
  • You can draw or stow two one-handed weapons when you use your object interaction, instead of one.

Barbarian

• Fast Movement. Starting at 5th level, your speed increases by 10 feet while you aren't wearing heavy armor. This bonus increases to 15 feet at 15th level.
• Ability Score Improvement. When you reach 10th level, you can increase one ability score of your choice by 2, or you can increase two ability scores of your choice by 1. As normal, you can't increase an ability score above 20 using this feature.

• Brutal Critical. At 13th level, you can roll two additional weapon damage dice when determining the extra damage for a critical hit with a melee attack.

Bard

• Magical Secrets. At 1st level, you have plundered magical knowledge from a wide spectrum of disciplines. Choose two spells from any class, including this one. A spell you choose must be of a level you can cast, as shown on the Bard table, or a cantrip. The chosen spells count as bard spells for you and are not included in the number in the Spells Known column of the Bard table.
• Countercharm. At 6th level, you gain the ability to use musical notes or words of power to disrupt mind-influencing effects. As a reaction or bonus action, you can start a performance that lasts until the end of your next turn. During that time, you and any friendly creatures within 30 feet of you have advantage on saving throws against being frightened or charmed. A creature must be able to hear you to gain this benefit. The performance ends early if you are incapacitated or silenced or if you voluntarily end it (no action required).
• Magical Secrets. At 6th level, choose two additional spells from any classes, including this one. A spell you choose must be of a level you can cast, as shown on the Bard table, or a cantrip. The chosen spells count as bard spells for you and are not included in the number in the Spells Known column of the Bard table.
• Magical Secrets. At 10th, 14th, and 18th level, The chosen spells count as bard spells for you and are not included in the number in the Spells Known column of the Bard table.
• Peerless Inspiration. At 20th level, when you roll initiative, you regain two uses of Bardic Inspiration.

• Song of Ages. Your music empowers your allies as their spirits are lifted during battle. You may use your action to play a musical instrument with which you are proficient in order to grant allies who can hear you within 120 feet a bonus equal to your Charisma modifier to skill checks, saving throws, and attack rolls. The song lasts for up to one minute as if concentrating on a spell (it requires concentration). Song of Ages ends early if you become incapacitated or stop playing your instrument (which you must play for the duration of the song). Once you use this feature, you cannot do so again until you complete a long rest.

Druid

• Added feature at level 11.
  
  Druidic Knowledge. When you reach 11th level, you gain expertise in one skill of your choice from the list of skills available to druids at 1st level.

Fighter

• Fighting styles have been revised.
• Extra Attack. Beginning at 5th level, you can attack twice, instead of once, whenever you take the Attack action on your turn. The number of attacks increases to three when you reach 11th level in this class and to four when you reach 17th level in this class.
• Flawless Champion. Your skill in battle rivals that of legendary heroes and demigods. At 20th level, whenever you roll an attack roll of 7 or lower, you treat that roll as an 8.
  
  Added capstone.

Monk

• Monk Revised section. It is a subpage under the Class Tweaks.

Paladin

• Fighting styles have been revised.

Ranger

• Ranger Revised section. It is a subpage under the Class Tweaks.

Sorcerer

• There is a rework by Khalabaster Prime that is advised to be played. It is a subpage under the Class Tweaks.

Warlock

• There is a rework by Khalabaster Prime that is advised to be played. It is a subpage under the Class Tweaks.

Atavist

• Introducing a fragile yet durable, martial half-caster that is based on Hemomancy. 
• Its theme is the more you get hurt, the more damage you do. Has health as a resource and spell slots too for offense. Don't let the hit die fool you as it also has features for defense.
• Subclasses are called Atavistic Aspects. Choose between Anomalous, Bloodied, Cruorwrought, Demonic, Heavenly, or Murderous.
• High risk, high reward.
• FILE 

Psion

• "Master a new mysterious power! Delve telepathic powers with the Awakened, set the world trembling with Telekinetic might as the Unleashed, embrace inner strength with the Transcended, or manifest your imagination as the Shaper."
• "Unlock Psionic powers. Combine Psionic powers. Explore your talents."
• FILE

Savant

• Introducing a new non-magical, supportive Int-based class.
• Its theme is of this scholarly vibe that really captures being a smartass (in a good way) in a world where dragons and liches exist.
• Subclasses are called Academic Disciplines. Choose between Archaeologist, Naturalist, Orator, Physician, Seeker, or Tactician.
• A bit underpowered compared to Paladins (as these are the benchmark to class balance as paladins are OP) overall. I'll let you play this if you really want to play it.
• FILE

Soul Binder

• Introducing a class that is based on having a summon/companion that is powerful.
• Theme is: You have bound your soul to another creature or creation. 
• Subclasses are called Soul Bonds. Choose between the Demonic Pain, Dirge, Divine, Dragonkin, Elements, Ooze, Playful Fey, Puppet, Soul Troll, Split Soul, Stitcher, Unknown, Verdant, or Wild. We have demons, devils, aliens, your own spirit self, elementals, dragons, fey, frankensteins, etc.
• I'll let you play this if your summon power fantasy can't be played as a reflavored pact of the chain warlock.
• FILE 

Warlord

• New class for the aspiring generals and tacticians.
• "Take to the field and crush your foes. Change the odds as a Tactician, or defy them as a Paragon. Ply your cunning as Packleader, or show your courage as a Chieftain. Make your companions look competent. They’ll thank you later."
• FILE