Pikmin 1-complete- Worth $20-30. Was in high demand a couple weeks ago.
Odama, completion questionable, box beat up ---Worth $20 or so. Not really rare.
Mario Games on GC--- All can get you at least $20
Guilty Gear X --- ?
King of Fighter XI ---?
Nocturne --- Not rare because there's a reprint, but if you still have the art book and whatever else comes with it, it could fetch some good money.
Disgaea 1 & 2 --- Disgaea 1 was reprinted massively, so its pretty common. I still see new copies of 2 everywhere.
Capcom VS SNK 2 --- Pretty hard to find. Worth about 40 bucks if its complete