As of now Kayle and Morgana are the only angelic champions, who were released a long time ago and there are no demonic champions I can think of (Teemo is up there, but that is a different issue).
EDIT: Tahm Kench may be a demon, but he isn't the stereotypical "demon"
ModThe Djinn1 votesAatrox? Aatrox is super demonic, by the fantasy tropes from things like World of Warcraft or even medieval mythology. Evelynn also has strong elements of a Succubi in her design.
For less "traditional" or euro-centric demons we have Ahri, Nocturne, and Shaco (literally "The Demon Jester").
Cryo001 votesOh yeah, Aatrox is present. My idea for a demon is more of like fire/darkness manipulating, so thats why I didnt consider the champions you mentioned. The lack of angels is still a thing though IMO.
GioGio Reference1 votesThis subject of more champ diversity also got me wondering...will there be any champs w/ psychic abilities? (
does not count for she uses magic and not here mind)
Ràinbow1 votesohh another angel champion would be nice. i love elegant, but powerful (preferably AD) type of champs.