Kris

My Unit is a custom character created by the player who participates in the game's stories and battles, similar to the Tactician from Fire Emblem: Rekka no Ken. My Unit is a youth of Altea who volunteers to join the Altean Knights one year after the end of Fire Emblem: Shadow Dragon. The prologue of Shin Monshō no Nazo covers My Unit's rise from a rookie knight to one of Marth's personal guard.

Players can change My Unit's name, gender, starting class, appearance and background. The default appearance of My Unit is the blue-haired, sword-wielding male who stands next to Marth in the game's boxart. The default female My Unit also has blue hair and wields a sword.