My design for him is just this one, standard dark brown eyes and wavy hair, has the energy of both a wet cat and an attention whore.
I don't really do much headcanoning I mostly just Rotate Blorbo in Mind, but I love collecting character playlist, to better rotate blorbo in mind to. I haven't managed to collect a full playlist for asmo (suggestions welcome!) but some songs I associate him with are kamikazee - stripped by missio and darkness settles in by five finger death punch
For Asmo Thoughts like most asmo enjoyers I obviously wish he wouldn't have been killed off, both because I would have liked to see more of him but also because the idea of him throwing his lot in with rand and the light, genuinely but not because of any desire for self betterment, just due to seeing light's victory as his only shot at survival and standing by rand's side as a new shot at glory, is really interesting to me and I would have liked to see where it would have gone more.
Also fun fact the first time I read wot as a kid I was actually relieved when asmodean died bc I was really worried about all the forsaken as threats and didn't trust him around rand at all. Truly one of my biggest attitude changes on a reread.
Favourite asmodean moments include the one in the aftermath of the battle of cairhien, when rand wakes up in the morning to two people in his tent who have been worrying over him all night, and they are aviendha, who's in love with him. And asmodean