"A wolf Transient who is never trusting, yet very gullible. He paints himself into a corner and then says, ""See? Now you'll betray me, right?"" In other words, he has a subconscious desire to be tied down and is generally a pain to deal with. He claims that he can withstand any sort of pain, and true to his words, is actually extremely resilient. He has long lost siblings: a little brother who has no concept of personal space, and a little sister who falls in love easily but goes crazy...literally. He's extremely easy to befriend if you show him sincerity."
Suspiciously and easily deceived, Fenrir likes to put himself into the dilemma of believing anyone he doesn't care for will betray and hurt him. He is a very troublesome tenkousei, and likes bondage. He states that he cannot be defeated by any kind of physical torture, and is surprisingly robustly-built. Having a brother-in-law alongside two younger, troublesome siblings; a brother who often who has no boundaries, and a sister who is easy to fall in love and become obsessed.
"In his home world, he was feared as the destroyer. His Sacred Artifact takes the form of a Rope, the Rule of which devours the powers of any who touch it, effectively sealing his own power. If anyone touches his Sacred Artifact, the seal will weaken, allowing him to use a portion of his true power; that which could create a torrent of such blood lust as to smother all hope."
He who was afraid of destroying the Earth, the land where he was born, has sealed his powers within his sacred treasure, a set of divine ropes that attaches its power to its user. But when another user tries to bond these ropes to themselves, the bondage will lose all power and fall apart. One example of this power is to create a river which devours all hope from its encountering enemies.
Regarding Fenrir's Charge Skill "Hróðvitnir": in the Grímnismál, Hróðvitnir is the father of Hati, who pursues the moon on its course. Additionally, Hróðvitnir is associated with Fenrir in Norse mythos.