Since I finished Silent Hill Origins, I went off to try Disgaea: Afternoon of Darkness. The reviews for the game are mostly outstanding and rightfully so. I played it for a while and loved the quirky characters and the gameplay. Its all the stuff i ever wanted, good subtle witty humor, halloween sort of theme, great character design and excellent voice acting. To put it in one sentence, "It's evil, witty cute".
Theres a lot of stuff to get into this version versus the PS2's; one thing is the extra Etna mode. Just check out the review links below for more details.
I'm hoping that they also get Diagaea 2 into PSP in the near future; and some added features would be great.
Oh yeah, they even got an anime out too. Check out the downloadables there, its kewl!