Known as the "God-Devouring Wolf", Fenrir is the firstborn son of Loki and is fated to devour Odin at Ragnarok. However, he was later subjugated by the power of Arthur Pendragon's Excalibur Ruler after being defeated by Vali Lucifer's Juggernaut Drive. He then becomes a "pet" of sorts to the group, but retains his human like intelligence and treats Bikou and Kuroka with disdain.