Three spirits inhabiting one suit of armor. They were brothers in life, but were killed by a pack of raideres, and decided to possess the suit of armor that they were gonna inherit from their father. 
Salut, the eldest spirit, is pleasant, smart and rational.
Ignus, the youngest, is fiery, rude, and ill-tempered.
Timi, the second-oldest, is timid/apologetic.
They all coordinate to move the shared body as one, but sometimes bicker. Their collective name is "Trois"