my fave pokemon is luxray! theres too many good themes....to match luxray tho i think a celestial theme would be cool

Vulpix, as for themes, Angelic, demonic, pastel, and galaxy!

I've got multiple favorite Pokémon, particularly Espeon, Lurantis and Volcarona at the moment. :0
Lately I've taken a liking to yume kawaii, but I also like surrealism. Dream-like imagery, generally, but not "dreamcore". Denpa-kei, whimsigoth and religious imagery are also up there.