Avnas'lividus "Avna"

He stands 5'9, with unnaturally pale white skin, demon horns, snake like fangs and eyes, fluffy black hair and pointed ears. They're clothing usually consists of ripped white jeans and a long sleeved black shirt with some variety here and there. They have a piercing in their tongue and left ear and markingson their horns.

Avnas'lividus is a party goer and a mischief maker, loving the thrill and fun such things brings. Friends and family are his usual target for both, dragging them to parties and pranking them, both being for fun and entertainment. When at school or work they have an incredibly good work ethic, they get motivated to do such things easily with them liking to keep such things organized and efficient. Oddly enough his the opposite when at home, his room is usually a complete mess, with things scattered about, there is a strange order to it though and he seems to be able to find what he needs quickly enough. Like his sibling he has a love of math and similar things, something he picked up growing up in his hell, yet a part of him in the back of his mind wants more, even though he isn't sure what. He has a very close bond with his sibling, who he often teases and such but is also very protective of.

Active Abilities:
Lowering Inhibition: By focusing on a person he can lower their inhibitions. The person becomes more willing to make bad decisions, choices they usually make. The person has to be within twenty feet and the affect lasts an hour, with him being only able to use the ability on any one person once a day.
Twin Head Swap: They can pull off their own head or their twin's head without much effort and without injury or mess, like pulling off a doll's head. Their head can spin 360 degrees even when attached and they won't be hurt by beheading. Can swap heads with their twin this way. They retain control of their own headless body, while their head is loose, but have to have their head attached to their twin's body to control it. Can remain separated from their head indefinitely, but physically weakens when apart by 30' increasing with distance. Loses control of body at 60'. Recovery time is proportionate to time separated, but as long as they do get returned to their body, they will recover, assuming they don't starve to death or get killed in the meantime. They can still be killed like usual when headless, if their body is destroyed the head will die too and vice versa. If they are killed with heads swapped, both heads detach.
Energy Feeding: Within 5' can feed off soul energy. They have to pick one target at a time and concentrate on them to eat. Have to feed off sapient beings with souls. Purer souls have less energy, children and believers are the worst food. Can't feed off angels or holy beings. Will eventually weaken and starve to death if they don't eat, about as fast as a human going without food. The feeding tires the target mentally and physically, they'd be completely exhausted after about 30 minutes, but is otherwise not dangerous, and they'd recover in the same amount of time with rest. From an average human soul, they require about three 30 minute feeding sessions a day to stay healthy, but they can spread this out into 10 minutes or condense it into a longer session. An innocent child they might take hours to get the same amount of energy.

Passive Abilities:
Physically Enhanced: Their strength and agility are at peak human levels.
Omnilingual: Can understand/speak all Earth languages, but this knowledge doesn't extend to reading/writing.
Natural Accountant: Can mentally perform and understand all the calculations of a good scientific calculator nearly instantly. Can count accurately at a glance up to 1000 visible objects, and can count higher with time. Always remembers what they've counted, and knows if even one object of a collection goes missing.
Extended Lifespan: Functionally ageless, could live for 10000 years.
Enhanced Healing: Heals two times as fast as a human, without scarring. Small cuts might only last a day, broken bones a few weeks instead of months. For anything major that a human couldn't normally heal, like regeneration, they'd have to return to their Hell to heal, and it could take months/years. If they can't return to Hell, life-threatening injuries could be fatal. They don't resurrect. Immune to natural poison/disease/drugs.
Sleepless: Doesn't need sleep. But still gets tired from physical activity and needs to rest.
Demon Tail: Tail is prehensile and can lift about 5lbs.
Twin connection: Can sense twin's presence and health. They get a general sense of each other's emotions and if one is injured. Can send mental alerts, like an alarm or distress signal, but not full telepathy. Feels any pain of their sibling at half strength without being injured by it or physically harmed.

Weaknesses:
Bacon!: Human food does nothing for them, but pork is like a drug or high dose of caffeine. They get very hyperactive and jittery with just one piece of bacon, have impaired judgement, and too much can actually make them sick and give them a hangover.
Holy Weaknesses: Holy water and Abrahamic holy symbols leave burns that won't heal naturally. Cannot enter churches/synagogues/mosques. A believer wielding a holy symbol can command them to leave a non-public space and they'd have to obey (though they could still come back in).
Gemini: Gets weak, listless, and depressed when more than 5 miles from their sibling. If kept apart long enough the damage could become permanent, starting around a couple days. Kill one, the other will become increasingly ill and also die within a month.

Living in the dorms with their twin, supported by a school scholarship.

Avnas'lividus was born in a Hell, in a parallel dimension nearly identical to Manta Carlos's dimension. His father was the chief accountant, who pretty much runs this Hell, even though the official ruler is the prince and he gets all the credit. His mother was a black zodiac personification of Gemini who got lumped in with demons in Hell. She was one person in two bodies, and passed some of this onto her sons. They were born after their twin, not being born together caused their twin to be born blind.

In their world, the supernatural was almost exclusively demons and angels, some spirits or personifications would end up being classified as demons or angels depending, but would all be contained to heaven or hell. And both Heaven and Hell were in charge of not revealing the supernatural to humans. So the twins were raised in Hell, not having much contact with humans outside of the dead souls, which were mostly being tortured and/or used as food and energy sources. Raised more as business assets than children, most of their education would have been math/business matters and corrupting humans.

This Hell's entire economy/power-base is run off of souls, specifically corrupt souls, and their energy. The twin's father noticed that the intake of these souls had been slowing, so he had many children by different mothers with the intent to train them then send them out to various other parallel hells in the hopes of finding solutions. The twins are originally sent to a Hell in MC's dimension, but the demons there just toss them at Starlight Academy for schooling so they don't have to deal with the two.

Has an older "twin" sibling. Technically not twins because of their age difference.
Main image is by EncephalonShards, given to me by Boop.
Icon is by Damn-iet, given to me by Boop.
Lore and abilities were created by Boop who gave me permission to use them.