Cell

Cell is a character from the hit world sensation anime and manga Dragon's Bane, where he serves as the antagonist of its third arc (or second, or seventh, depending on how you count them), the Android/Cell Arc.

Cell is a bio-mechanical (kinda like a cyborg but not really) lifeform created by the Red Ribbon Army's last working member, Dr. Gero, who for some reason modeled him after a cicada and gave him gross bug features, and also made it impossible for him to reach his full potential without finding and absorbing two other androids (who did not consent to it) first. Talk about bold design.

He is also obviously playable in BT3 and part of the TheGreatTeacher tournaments announced on 4channel's /v/ - E-Celebs.

Character
Cell is an absolute autismo in the same ways Dragon Ball's protagonist Goku is, but made eeeevil, because he's addicted to fighting while disregarding the well-being of anything around him (while Goku is mostly oblivious to it).

As per Dr. Gero's programming, Cell's only interest and objective in life is to become the "PerfectTM Lifeform", and to prove himself the strongest (or as he says, to see the face of weaker beings "twist in fear" before killing them). After he reaches his Perfect Form and has nothing else to do, he decides to set up a mock tournament against Earth's strongest warriors called the Cell Games, which he believes he's sure to win reagardless of opponents, only to prove himself the mightiest warrior on Earth. He would presumably do the same in other planets after being done with ours, but his reign of terror was ended once and for all by our one and only champion. In the brief span between the announcement of the Cell Games and its arrival, Cell joined the American NBA Basketball team The Orlando Magic, shattering several dunk records and projected to be the year’s MVP until his untimely demise.

Due to his fighting addiction (scientifically called Waku-Waku Disorder) Cell is prone to making the same mistakes as his opponents, like letting Gohan transform only so Cell could beat him to prove himself greater in the same manner Vegeta let Cell himself transform in order to get a better fight, conveniently forgetting those actions nearly led to Vegeta's death. He is also a sore loser and tried killing himself to take his opponents down with him as soon as things turned bad for him.

In BT3
Cell has 4 (four (quatro)) forms: Imperfect, Semi-Perfect, Perfect, and 'Super-Perfect' (???), and has health regen with every single one, making him the single best character in the game*.

In addition to the aforementioned health regen, his first and second forms have a succ move, meaning they can steal the opponent's health while adding it to their own, and that alone makes them solid picks. His last two forms however lack that ability.

For some reason, his voice is terribly mixed, and so final form Cell's shouts sound like the first form's, among other audio oddities. He is also one of the few characters to have the honor of being represented in one of the server's Twitch emotes.

* excluding possible riggings.