Persona 3 Reload’s Episode Aigis (The Answer) DLC borrows some aspects from the base game, including the aloof attendant Elizabeth and her requests. One of them tasks you with Fusing a Sarasvati with Agilao, which isn’t entirely unfamiliar.
The 21st Elizabeth Request is the start of her Fusion Series, and it’s on the easier side once you know what Personas to look out for. It’s like making a Mothman with Agilao all over again.