Luca (ルカ, Ruka) appears in Diamond Records as both a playable character and an assist character.
Playable
Luca appears in Diamond Records as a playable character in only the Tactical Battle game mode. He has one 'Fighting Spirit' type 6 star statue. Luca's 6 star statue was added to the game during the April Fools 2019 event, and notably only has a single weak basic attack in his moveset. He also appears as a boss character in Tactical Battle stages, where he has an additional attack.
Assist
Luca's assist form can be used in both the Action Battle and Tactical Battle game modes. He has a 3 star assist, and a 4 star assist, both of the 'Fighting Spirit' type. His 3 star assist does not include an assist ability, as 3 star assists only function as stat boosts for the playable statue they are equipped to. Like all assist characters, when the active assists link together, his assist ability may provide extra effects (Action Battle mode only).