I'll be honest, the Yoko Taro SEGA game seems like kind of a really weird and stupid premise with no major appeal, so I don't think this'll last long, but hey, more classic SEGA shoutouts! I ain't complaining!
Anyway, a while back ago, I made a list for myself of all the IP SEGA referenced across their 60th anniversary material. I think that's probably a good frame of reference for which IP could be in this game, as it gives us a window into which IP SEGA treat with reverence. That said, I've decided to exclude A. a lot of these sorts of Japan-only mobile and card games and such, as I feel they kinda clog up the list and I want to focus on the ones with IMO a more established presence in SEGA's oeuvre, and B. IP that only appeared in their DJ Mix album, as those songs were picked with the intention of flowing together and not necessarily of being a "greatest hits" of SEGA music. I've also decided to exclude Atlus stuff for now, as we have no idea if those will be thrown in the mix. Otherwise, here's a decent chunk of Stuff SEGA Have Shown To Like Putting In Stuff And Thus Could Show Up In Here:
so er yeah I think this is a decent estimate of what stuff could show up in the mobile game, though obviously not all. there are a few other IP that are nowhere on this list but I could theoretically see getting a shoutout