I can never pick one thing and stick with it when it comes to this! xD But I will say that my crushes were mostly from PSIII, though PSIV gets a mention or two. :3
But if I must choose, I'll go with
Aron on this one!

He's so cute, and I
love his facial expression in his portrait...so serious and determined! Stark contrast from the goofy, if not nerdy, personality he displays in Toyo Ozaki's self-published manga. I find that it makes him even
more adorable, however... <3 This calls for a change in avatar!
Honorable mentions: Rhys, Nial, Lune, Lyle, Crys, Wren, Rune
Yes, I stuck that last one in there for you, Rune_Walsh!

He's grown on me!