Mister Treasure is the yukkuri equivalent of a human toy, and as such denotes items owned by koyukkuris, and used in their childish games. In stories, "Mister Treasure" mostly appears in its slurred form of "Mishter Threashure", as a koyukkuri could say it. Much like human child would antropomorphize and speak with its favourite toys, is not uncommon for a koyukkuri, especially a lonely one, speak with its "Mishter Treashure" as it were its best confidant. Also, koyukkuris may argue for the possession of a particularly prized "treasure".