Shadow and Blaze - Doodle

Fan Headcannon - Having an heavy part of his genotype based on lizard (Biohazard) Shadow is actually kinda cold-blooded, he can heat himself up by using his passive chaos energy or simbly havng his inhibitors rings, who derive the energy into slight heat, but when he relax. Cold make him react and think slower and slower.
Blaze, of course, doesn't even feel cold if she want to.