Slinker

He gained infamy in the Lower Arenas due to his high jump velocity, elastic limbs, and unending ferocity when chasing his opponents in the pits. There was an incident where he crashed into an opponent at half of Mach 1 speed, causing a massive explosion before repeatedly jumping on them with his spiked explosive feet, obliterating the middle portion of their body and killing the opponent. This resulted in Slinker being disqualified from both this Alkaline Games, and the next four after; to top it all off, his rank was reset to Stage F.
Slinker was unexpectedly unbothered by this series of events, only being mildly annoyed. In order to "get a head start" for reclaiming Stage C access, Slinker would enroll himself in an Illegal Match, wherein he slaughtered four spectators and one of the combatants in his zeal to win.
As further consequence to this, Slinker would get the lengthy sentence of just 13 years.
[Prelude]

Due to a change in Legislative Processing, Slinker was released ten years ahead of schedule, quickly carving himself back into the latest Alkaline Games through a brutal display of agility and technology, as he had received upgrades from an unspecified party that allowed him to exceed 75% the speed of Mach 1. Slinker's weaponry would also be upgraded, swapping out his URO-18 Machine Guns for FGR-26 Flicker Cannons and URI-53 Missile Pods for FGR-13 Trajectile Nests. Both of these new weapons also came from unspecified sources.
With this new tech, and usage of his tail and tongue in combat, Slinker would climb all the way to the upper regions of Stage F; soon enough, the news of his return to the Alkaline Games would reach the Greater Sectors, most of whom were appalled on how dangerous Irrationites such as himself were ever released, let alone allowed to partake in the Games.
This would come to a head with Match Number {???], with the contestants consisting of Hook Master: