If you haven't already made your level 30+ Personas, here's a brew that covers AoEs of all elements so Wonder can exploit any weakness and knock shit down to proc his weapon's Def shred.

Phoenix and Anzu are the only Ma-la users for Nuke and Wind respectively.
Leanan Sidhe's innate is better than Mapsio (which is also unavailable at 30), but a Matador seal for Mapsi can be used if you want to swap her to a different Persona like Uzume.

The passives are flexible; Phoenix already comes with 2 fantastic ones for damage so doesn't really need changing. Leanan could go with anything; Auto-Mataru II (Rakshasa Seal) and Auto-Maraku II (Naga Seal) are probably optimal. Auto-Mataru I (Ippon-Datara Seal) and Auto-Maraku I (Apsaras Seal) for more budget options. Personally mine's using Auto-Maraku I and Diarama from trying to inherit Maziodyne.