Disgaea has never released on a home console other than PlayStations.
Nobunaga's Ambition home console versions haven't released on a system other than PlayStation since SNES (which is a shame, because the SNES had its best following. The series almost never reaches the West now).
The real shame I think is Godzilla. I was disappointed to hear this would be a Sony exclusive considering this was another series that peaked on a Nintendo platform (Godzilla: Destroy all Monsters Melee on Gamecube).