Demonic Genes: From her demonic father, Marsha has the ability to absorb people's souls. In addition, Marsha has enhanced speed, strength, and senses (mostly sight, hearing, and smell). Marsha, had she not had her soul replaced with one made with dark magic, her natural lifespan still would've been extended. Marsha also possesses the ability to possess bodies via entering a body through black smoke and the ability to make deals where she does something in exchange for something (a deal that can be magically enforced). She also has a high resistance to fire. In addition, Marsha is also extremely flexible like her father such as being able to get up onto her feet without needing to grab something to pull herself up or being able to turn her head 180 degrees without much difficulty or discomfort. Marsha also has the ability to access a dragon-like form when enraged.
Nightosphere Beasts:
Dark Magic User: Marsha is proficient in her use of dark magic, which gives her the ability to fly, minor control over fire, moving objects with her mind, shape-shifting, creating barriers, and necromancy. She is also proficient at creating hexes and potions as well using runes or creating ward.
Prophetic Dreams: Ever since she was a child, Marsha has vague dreams that foretell of an event to come.
Recreated Soul: As a result of Marsha's soul being recreated using dark magic, Marsha is immortal and unageing. In addition, Marsha can rapidly heal and can't be killed unless the six sentimental objects used to create her soul are destroyed.
Musical Talent: Marsha is a lovely singer with a voice that's capable to calm and have control over demonic animals. She is also very proficient in playing guitar. In addition, Marsha is a talented and graceful dancer.
Intelligence: Marsha has a mass arcane knowledge. In addition, she is intelligent in a number of areas such as magic and animals.
Writing: Marsha is very talented at writing.
Night Scythe: Marsha's signature weapon is the Night Scythe, a scythe infused with nightosphere magic. It linked to Marsha, allowing it to fly into Marsha's hands when she psychically calls for it. It has the ability to absorb the souls of those it kills, giving Marsha a power boost when she used it in battle. Similar to Finn's Night Sword, it's a weapon that can harm ghosts and because it was made using Hunson's magic, it can shackle and negate his powers. Because the blade was made with angelic steel, it can be a weapon used against angels.
Demon weaknesses: Because of her demonic father, Marsha is vulnerable to the typical demon weaknesses such as holy water, salt, and holy weaponry. Marsha also hates cold environments. It should be noted, however, that Marsha can still heal from being struck with a holy weapon but the healing process is slower.
Magic Overuse: Marsha can only use magic so much before it tires her out. When she overexherts herself, it can result in her collapsing in exhaustion and/or bleeding from her mouth and/or nose.
Emotions: Marsha's powers are highly influenced by her emotions, primarily her negative emotions (fear, anger). In addition, the spell used to recreate her soul has the side-effect of amplifying her negative emotions, most evident in her anger.
Feral Mode: Similar to Marceline, Marsha can enter a "feral mode" when she becomes ravenous out of hunger. This state will only subside if she consumes a sufficient amount of food or souls.