This is done by the Social Link holder gifting Makoto Yuki/Kotone Shiomi a special item during the Rank 10 event that allows them to fuse for that Persona. Unique to the P3 games starting with FES is a Persona that can only be unlocked upon completing all the Social Links in the game...
Maxing out his Confidant unlocks the fusion of Odin. The player will also receive an item from him near the end of the game which will unlock the ability to replicate Skill Cards once Yusuke's Confidant is unlocked in New Game Plus. His special hangout event happens when you take him to...
During the fusion tutorial the guide says to fuse Arsene and Pixie into Agathion, passing on Eiha and Zio. However, I only have one available slot for passing on abilities. Did I do something wrong at some point? I notice the guide says (Chariot, 3). My Chariot confidant is only at ...