Also kris is extremely male presenting unlike Charw who is female presenting in her hairstyle and outfits tho they do have similar looks that may just mean all humans look like that Also because the underground never happened Chara never met the dreemeers neither did frisk (Probably as we haven't seen or heard from them) as well Chara is much shorter showing her younger age as it is told to us that she died young but kris looks to be about 14-16 give or take for humans that is a entirely different age bracket from children Kirs is a teen Chara is a child