Morgana makes his debut in Persona 5. Morgana is a strange catlike being who Joker and Ryuji meet when they first enter Kamoshida's Palace. Morgana has been captured and is locked in a cell in the same block that Joker awakens to his Persona in. As the two are making their escape, they pass by Morgana's cell, who convinces them to free him. From then on, Morgana teaches Joker and Ryuji about how to use Personas and how to be Phantom Thieves. Morgana also introduces the team to Mementos, and asks them to help him explore it, as he believes the secrets to his past are locked away in its depths. Despite his feline appearance (becoming an actual cat outside the Metaverse), Morgana emphatically insists that he is not a cat, but a human. He has an unrequited crush on Ann, whom he calls "Lady Ann," believing it to be chivalrous. Morgana's Persona is Zorro, based on the pulp fiction swordsman of the same name, who uses wind-based attacks, has access to a wide variety of healing spells and act as a temporary navigator. Morgana is also able to transform into a bus which he calls the "Morganamobile". His explanation for this is that "for some reason, cats turning into buses is an extremely widespread cognition among the general public."
After the team confronts the Holy Grail and loses, they awaken in the Velvet Room. Morgana reveals that his memories have returned and that he was born in the Velvet Room, created by Igor from the hopes of humanity in order to guide the Trickster so that they would have a chance of defeating Yaldabaoth. When Yaldabaoth is defeated, Morgana vanishes, but returns in his cat form after Joker is released from prison.
His codename as a Phantom Thief is Mona.
As a background character
Morgana appears in his bus form, dropping off the Phantom Thieves at Mementos.
As a costume
Morgana appears as a paid DLC Mii Costume as a hat.