Mousbu was the first wolf in the pack. He was Nazrix's mate until a female wolf named Azra joined the pack. Mousbu and Azra had 4 pups together, all but 1 died and Azra left the pack and Mousbu, leaving him bitter and heartbroken. Mousbu is very close to his only surviving pup with Azra, Mantis. Mousbu did have another litter with Nazrix after Azra's departure but he's extremely distant with them, mostly out of guilt and fear. He's especially distant with Terra, as she looks almost identical to one of Mousbu's and Azra's dead pups. His unfriendly nature stems from these events and makes him extremely distant and quiet towards the rest of his pack. At the beginning of his time in the pack, Mousbu was a pupsitter, he now refuses to ever be pupsitter again and is now a hunter, he uses his role as hunter as a coping mechanism and he's starting to warm up to his hunting partner, Urska.