With how many *good* DRPGs the Vita had, it's ultimately somewhat of a shame that we never really got most of them in the west on that platform, though I am happy that they came out on other platforms (Including PC!).
I think the only two left that are "Vita trapped" are Demon Gaze 2 and MeiQ - Labyrinth of Death. I'd really like to see Demon Gaze 2 either get it's emulation sorted out or get ported; I love Experience's stuff, and while I could break out my Vita to play DG2, I'd rather play it along side everything else!
EDIT: ... I think I said that, and then one of the more recent updates finally made DG2 work on Vita 3K.