Kingdom Hearts and Sonic.
Kingdom Hearts especially, as I'm pretty sure Gamefly has all the games. Not a big fan of how Squeenix is like "ALL THE CONSOLES FUCK YOU PEOPLE THAT LIKE/CAN ONLY AFFORD ONE CONSOLE FAMILY" and I'm not a huge fan of Squeenix's general direction these days, but I love the KH universe and greatly enjoyed KH1 (literally the only one I've played). It's got a pretty tight continuity from what I can tell though so I'd want access to all the games - I can do that via Gamefly. And it's heavy AU, so I can live with the destruction of much loved Final Fantasy characters by reminding myself of that. XD
Sonic is a bit trickier simply because there's a whole era I flat out can't play. My computer isn't strong enough to emulate Dreamcast, so I'd have to miss the 'soft reboot' feeling Adventure games (well, that's what they seemed to be based on what I've seen of them giving I haven't played I can't say much). I did enjoy the RPG for the DS that came out (that is pretty much non-canon now because copyright issues) and spending a lot of time browsing Sonic fanart is making me miss it. XD And I'm a brony and a casual furry so I can deal with any 'problems' people say the fanbase has. XD AND YES I WANT TO PLAY SONIC '06 /FUCK THE POLICE/. XD All the recent Sonic games have really gotten me re-interested in the franchise. XD
tl;dr Gamer Problems
PS - Advising me that it's a waste of time will only make me more interested. I respect if you hate either of the franchises for any reason but I gotta make my own opinions. XD See: Yes I want to play Sonic '06. XD