WTF kind of class is this!?

Character Introduction: Part 1 (written by Chess)

Name: Nefret Aquaria
Appearance: Dark blue hair, swamp green eyes, slightly dark skin
Abilities: Can control water (not liquid), breathe under water and talk to aquatic animals. She can also lure people with her beautiful voice. Her legs have the ability to transform into a mermaid's tail.
Personality: Civil and polite to everyone but never lets anyone get close. She doesn't have any friends, acquaintance maybe but not friends.
Background: She's a mermaid who came from Egypt (her ancestors migrated there from Northern Europe to escape the vikings). Of course, being a mermaid, she sunk various ships by luring them into rocks with her voice.

Name: Pyro Hesphas
Appearance: Red hair, golden eyes
Abilities: Can create and control fire. He's also fire resistant.
Personality: Brash, rude and aggressive. He's your stereotypical delinquent biker who is also a pyromaniac.
Background: Pyro was a human born heir to a mafia empire. Said empire was burned down to the ground when he somehow manifested Pyrokinesis. He was later adopted by a nice old couple who were unable to bear any child. Some time in his early teens, after his adopted family passed away, he became a delinquent and then an arsonist.

Name: Toxica Mortis
Appearance: Purple hair and eyes, pale skin due to locking herself in her lab for really long times
Abilities: Regeneration, immunity to all kinds of toxic.
Personality: In her eyes, everyone is just a test subject. Selfish, only caring for herself and her experiments.
Background: Toxica was prodigy in chemistry. She was the daughter of a biologist (mother) and a brain surgeon (father). With her parents to busy with work and praising her, she never learned what the hell morals are. When she got older, she conducted a lot of experiments, combining science with magic and the supernatural, most of them being illegal and/or inhumane. Thanks to her successful experiments, she now has regenerative abilities and is immune to all kinds of toxic.

Name: Chauve D'Noir
Appearance: A gray robot with a small storage space in its stomach, a camera on its chest and anti-gravity devices under its feet. Its right arm is an energy blaster but can also compress energy and mold it into shapes, the right hand is made out of compressed energy (cyber green).
Abilities: Create temporary weapons and blast energy using its right arm, float/fly using the anti-gravity devices, hack into most electronic.
Personality: Kinda anti-social and more often than not, mysterious, creepy and vague.
Background: Chauve used to be human. He was a robotic and computer genius. He was also a shut-in a really good hacker by the name 'The Monochrome Bat'. So good in fact that the Government chased him down. In order to escape the Government, he uploaded his brain onto one of his robots. His body went brain dead after that and was later cremated. Chauve, now in his new robot body was able to escape. Unfortunately, he was ultimately captured by the Government and was sent to this class of underage criminals.

Note #1: Yes, that's 12 OCs. The intention was to fill a class, which has at least around 20 students and Sisi said that she could only do 3 so there you go. Twelve fricking OCs.

Note #2: All of them have been nerfed. I don't have any OCs for fandoms, just OCs for original stories and ideas and, apparently, my younger self creates really OP OCs. Seriously, if you think Daemon is OP then I say that he's nothing compared to how he originally was. Originally, he was not just OP, no, he was broken.

Note #3: If anyone wants to know, each picture took me about 45 minutes to draw... Except Chauve because he's a robot and proportions for aren't really necessary, in my opinion at least. He took me around 20 minutes. Less if it wasn't for the bat on the screen.

Note #4: To the rest of the YandereChips: It's your turn. I will be awaiting your OCs.