Protect (かばう, Kabau)? is an ability in the series.
Protect allows the party member with it to protect the protagonist from a fatal attack and take the blow in their place, preventing a Game Over.
Persona 3 Portable
Unlike Persona 4 and Persona 5, Protect can only be unlocked after ranking up Fool Arcana Social Link up to Rank 5. The entire party will automatically learn this move without the need of ranking other Party Social Link.
Protect is a Social Link ability each party member learns at Rank 1 of their Social Link.
Protect is now learned at Rank 9 of party members' Social Links.
Persona 5 / Royal
Protect is a Confidant ability party members are able to learn. Generally, most allies learn this ability at Rank 9, with the exception of Goro Akechi, who cannot learn it in Persona 5, but can access it in Persona 5 Royal at Rank 10.
Persona 5 Strikers
Unlike Persona 5, Protect is obtained from the start and is activated when a player character is about to take a fatal blow. Unlike previous games, Protect will not leave the member with 1 HP.
A similar mechanic is present in Devil Survivor. Some demons can learn skills that would protect the field Leader such as Hero Soul, Knight Soul and Paladin Soul. If equipping a demon with this skills, the demon will take that blow instead to protect the field leader and endure the fatal blow.