Seeing as how you are a Persona 5 fan like myself, you probably have all / a lot of the same ideas as me. Soul Hackers, Devil Survivor, Digital Devil Saga, Digimon, Tron, etc. all do apply very well. Oh and of course the Phantasy Star Online series.
For cyber settings, AI always makes an interesting villain/ally. People always make the AIs the bad guys, but I like it better the other way around. I liked Terminator 2 and Genisys because of that. :D Also liked EDI in Mass Effect. I suppose I'll press the idea for making an AI character an active role in the party besides a "helper bot" like they did in SMT IV.
I'm going to need you be more specific of what kind of ideas you are looking for, because otherwise you will probably be saying stuff like "I thought to same thing" or "Yeah, I want to do that".