Sierra (Ko no Nakama-sama)

Sierra (シエッラ Shierra) is one of 11 souzougamis. After the events of MushoTen: The Novelings, he distanced himself from the people and lived mainly in isolation, only occasionally returning to interact with the inhabitants of his world.

Appearance
While normally appearing as a large, vaguely humanoid creature of black, red and golden dust, he takes the form of an 18 year old male while interacting with inhabitants of the world. In this form, he has bronze-brown hair, brown eyes and a twin onyx earrings, one on each ear.

Endurtha - Steel Dust
Endurtha has no true shape. It can take the form of any wieldable weapon following its user's will. When it shifts from one form to another it becomes like water before reassembling itself into another weapon.