I would commission callasoiled more

To be completely honest I think IIDX is at this point already a spiritually dead game that underwent complete franchise-ization, so I imagine the odds of being able to do anything particularly interesting as IIDX sound director are low. if I'm just picking artists and musical styles I want to see in IIDX: more callasoiled, more sayohimebou, more parkgolf, more pasocom, commission Oshirijima, commission Paisley Parks, commission good-cool again, have more IDM, have Neosignal-type weird neuro stuff, have recent genre developments like hardwave and amapiano or gqom. Commission pengaton and VOLANT if overseas artists are a possibility (it really feels like they aren't right now)

other than that the current IIDX regulars are mostly all safe bets in terms of making songs I like. it would be nice if the BST artists were asked to make music outside their usual comfort zone more often though