The Disgaea D2 Additional Trophy 5 Add-on for Disgaea D2: A Brighter Darkness has 3 trophies - 3 bronze.
Requirement: Make DLC character Overlord Priere join your party. Might makes right, and I'm the mightiest!
Requirement: Make DLC character Priere join your party. Confess!
Requirement: Make DLC character Eclair join your party. The Princess has arrived!