Micro

Micro is a mutated marsupial-mouse and one of the central protagonists of the sci-fi series, Extinctioners : he was created by the Invasion Force as part of their continual plans to conquer time/space but would grow to distrust his masters and ultimately rebelled against them alongside Warfare after deciding they were evil (having seen the cruelty they inflicted upon other species, including the destruction of an entire world and a populated space-station).

Micro originally had no real name but as part of separating himself from his old masters and founding his own destiny he would gain the civilian name of "Jacob White-Eye".

Due to his cruel past Micro was originally timid, unable to socialize well and had a deep phobia of felines - things he started to tackle as he formed friendships with Alley Cat and her friends, living with the felines after helping to liberate several slaves from the Invaders.

In terms of power Micro can grow to massive scales or shrink down to near microscopic size - he is limited in how large he can grow as his body is still run by physics and their will reach a point he simply becomes so large he runs a risk of injury to himself or others, his ability to shrink is much less defined but presumably has a similar limit.

Micro is also superhuman in terms of intelligence, having a brain comparable to the most advanced super-computers of his time - meaning that with enough resources Micro can overcome nearly any obstacle, if he is so inclined.