Save Data Conflicts: Occasionally, save data created before DLC was installed can glitch. Try starting a "New Game" on a different save slot to see if the characters appear there. The Legacy of Harmony of Despair
If you have installed the files but the game still looks "Vanilla," check the following: castlevania harmony of despair dlc pkg work
Unlock Files: In some cases, the DLC is already in the game data, and the PKG acts as a tiny "unlock key." If the key is missing or unsigned, the content remains hidden. Save Data Conflicts: Occasionally, save data created before