So I have finished FF7, Harvest Moon, Phantasy Star, and Persona 3 and am playing KH Birth by Sleep. I love those games so much, do you have any recommendations for RPG games like that? Like your favorite one, maybe. I tried The 3rd Birthday but I get stuck and I downloaded another games but it ends up not really interesting because I have no idea. Sooo do you have any?
Honestly, you've already named most of the games I'd consider for PSP. BBS and Persona 3 in particular (still haven;t finished Crisis Core), but I'd reccommend the Dissidia final fantasy games. Actually, you could even just get the second one as it has the story of the first as a playable mode as well and it generally just plays better.
Oh I had Dissidia before but deleted it cause it's.. not my type. Dunno, just don't like the battle system and a lot of playable characters made me confused of the story. It's like a version of Dinasty Warrior but in a less way.
This isn't an RPG (I love all the ones you mentioned) but God of War is a pretty fun experience for PSP (although a little short). I recommend it!