Parasite Eve. Needs a sequel that's a mix between the two existing games. I'm hoping that the only reason we haven't seen PE3 this gen is because Square Enix couldn't do it justice with PS2 realtime graphics. Yeah right. :lol 
Beyond Good & Evil. Wouldn't really have needed a sequel if the cliffhanger hadn't been there. But now it is, and I'd like to see a BGE 2 that's not as rushed and doesn't feature a jerky framerate.
Shadow of Destiny/Memories 2. One of the few early PS2 titles that still manages to hold up well. Throw in a new cast and setting and you're good to go, Konami.
Final Fantasy Tactics. Get Matsuno back to doing what he does best. Either that or Vagrant Story 2.
Beyond Good & Evil. Wouldn't really have needed a sequel if the cliffhanger hadn't been there. But now it is, and I'd like to see a BGE 2 that's not as rushed and doesn't feature a jerky framerate.
Shadow of Destiny/Memories 2. One of the few early PS2 titles that still manages to hold up well. Throw in a new cast and setting and you're good to go, Konami.
Final Fantasy Tactics. Get Matsuno back to doing what he does best. Either that or Vagrant Story 2.