Diablos

Diabolos (ディアボロス, Diaborosu?), also known as Diablos, is a recurring creature in the Final Fantasy series that has most often appeared as a summoned monster. He first appeared in Final Fantasy VIII and his trademark ability is Dark Messenger, which usually deals fractional damage based on the target's HP. Even though his nature and backstory change, Diabolos's appearance throughout the series is consistent.