Since you like RPGs so much and asked for Genesis games. You must play Phanatasy Star IV. It's one of the best RPG from the 16-bit era and easily just as good as what the SNES had to offer. It has great 16bit graphics, fantastic music, a unique and interesting story, great characters, cool manga style cutscenes, and awsome boss fights.
There's also Phantasy Star 2 & 3 which are quality games too, but PS2 is kinda dated and PS3 is a love it or hate it kind of game.
If you have a Master System there's also Phantasy Star which predates Final Fantasy.
There's also Phantasy Star Online and it's sequels. I know that at least the Dreamcast one can still be played in single player mode and there are private serves still running it online. Awesome.
Other than that I've allready recommend to you the best Saturn games like Panzer Dragoon Saga and you are aware of Skies of Arcadia. There are tons of great Sega games. It sucks I can't get them all on one console anymore, but I still play the best new Sega games. I just have to buy more consoles to play them on.
