

Anytime a player StreetPasses any player with any version of Fates, they will receive a visitor Avatar. Players are given a Ranking, similar to Renown in Awakening, but divided into a Battle and Visitor Ranking. My Castle also serves as the main hub for StreetPass. All features and upgrades requires that the player reach a certain chapter in game in order to use. In order to build and upgrade facilities, players need to acquire Dragon Vein Points by participating in battles or visiting other My Castles. Characters in the Player's army can also be found wandering in the area and can be interacted with for a variety of events as well as unique dialogue depending on the time of day. My Castle is mainly viewed from the top down view with Corrin portrayed by their map sprite, however, they can toggle their view to see the base from a 3-D third person perspective. These events refresh every time a map is completed or certain time in the real world has passed.

Like the Barracks in Awakening, My Castle is a gathering place for the player's army and certain events can be triggered by the characters there. My Castle is a customizable base of operation available in all routes of Fates. Later, after the events of Chapter 6 in any path, Lilith brings Corrin and either Felicia or Jakob depending on Corrin's gender into the Astral Plane where they decide that the area will be used as Corrin's main base when not in combat. After explaining the nature of the area and building Corrin's Personal Quarters, she sends them back to the Bottomless Canyon N., but warns them that they should be careful of enemy ambushes. As they fall to their presumed death, Lilith appears, changes into her dragon form and rescues them by sending them both to the Astral Plane. However, the Ganglari flings them into the Bottomless Canyon. Enraged, Corrin discovers their Dragon Fang ability and attacks him. After the battle at the Bottomless Canyon, Hans betrays Corrin by attacking Gunter, causing him to fall into the Bottomless Canyon.
