Drew this a couple weeks ago in zylum's sketchbook.

Rilo is my slime, and the little headshot there is Zy's Fior.

Anyways, Rilo grew up in the arctic with a human tribe and against the odds managed to survive quite well with the use of a fire center within him. Eventually he longed to seek out others like him, in a much warmer climate, and thus he met Fior. He has an insatiable appetite for fruit and his slime tends to change depending on how much of what he consumes and how warm/color he is.