The Disgaea D2 Additional Trophy 6 Add-on for Disgaea D2: A Brighter Darkness (EU) has 3 trophies - 3 bronze.
Requirement: Make DLC character Nisa join your party. Don't call me flat!
Requirement: Make DLC character Gig join your party. I am the all-powerful Gig!
Requirement: Make DLC character Plume join your party. The Battle Princess has arrived!