Valkyrie Profile Series

ConsoleNameDeveloperLucca's Observations
DSValkyrie Profile: Covenant of the PlumeTri-AcePrequel to the first Valkyrie Profile; an SRPG where permakilling party members voluntarily can greatly aid in battle
PS2Valkyrie Profile 2: SilmeriaTri-AceSimilar combat and dungeon exploration as the first game, but with no time limits or pressure to release Einherjar
PSPValkyrie Profile: LennethTose/Tri-AceAn English port of the Japanese PSX version, not too different overall but does spiff up the localization a bit and adds a few cutscenes
PSXValkyrie ProfileTri-Ace2D dungeon exploration, grim themes, and a combo-based battle system