A young thief. His master was a sadistic person, gave him a degrading name, and forced him into a life of scavenging and pick-pocketing to support their Godori habit. His thieving prowess was eventually noticed by a Darigan Bori named Voromahery, the leader of the Haunted Woods arm of the Thieves Guild, who was so impressed that he asked the Aisha to consider joining the Guild. Monster didn't hesitate to accept the offer and abandoned his master without a second thought.

While he is indeed a capable thief, the Guild soon discovers that he is also easily distracted, and prefers to amass heaps of useless garbage rather than valuables. Kleptomaniacal, street-smart, and yet more than a little stupid, he often stashes toys and other coveted shinies away in his own secret hoard at the Guild base. Voromahery occasionally hunts down this pile to discard the trash or pawn things off for a quick buck, much to Monster's dismay.

He keeps a female Droolik named Mite who he found loitering next to a tombstone in a graveyard. Her body is covered in scars, likely inflicted by her previous owner, although Monster has only added to the collection since then.