https://villains.fandom.com/wiki/Amaimon
https://aonoexorcist.fandom.com/wiki/Amaimon
Amaimon shows to be calm & collected, but holds his power in a very high regard, very brash &, overall, quite carefree. Is angered & annoyed when someone ruins his fun. He is very playful & doesn't take his opponents seriously in battle. He does not tolerate being laughed at and does not like to be ignored. He hates losing.   Not very expensive with language except when engaging in battle. Demon king of Earth.

Cold, calm, hates being ignored, loves snacks

https://undertale-au-fanon.fandom.com/wiki/Papyrus/Swapfell
Overprotective of his brother behind his bro's back. Im punny, lazy, not-talkative, monotone, tease/flirt, chill, reserved. Likes BBQ sauce, smoking, drinking, nonchalant. Hes collared by his brother. Freed from the underground with the other monsters & now lives on the surface. Has a datemate who is a human. Papyrus is from fellswap, he is not obsessed with spaghetti. Is tall and a skeleton