I have a world that I largely have figured out in a big picture sort of way. It's sort of a Buddhist realms style "multiverse" with multiple realms encompassing the true universe. In this multiverse people can travel between worlds in the multiverse, and while largely keeping their same biology, they may be forced to adapt a more humanoid form. My problem is that I am having trouble with is how to represent a humanoid from a more extreme realm.
Take for example a human-like creature from Dante's 9th circle of hell. My thought is that some variety of alternate evolution could have taken place, where rather than evolving a more insulated body, they instead evolved into a creature with a lower body temperature so they could reduce the amount of energy required to maintain their core body temperature. Perhaps they even developed hair in shades of white, grey, and blue to reflect more energetic wavelengths of light to prevent their body from getting too warm.
Now my question is: for this variety of creature what other traits could one expect a common example of such a creature to exhibit on Earth? For example, since hair and skin color are caused by the same chemicals, would one expect a different common skin color? Would their height and "energy" requirements be greater or less than those of a common human?
I hope this is clearer than my original question. It is kind of difficult for me to put into words.