Mentally Unstable Mineral

Overview
Mentally Unstable Mineral (M.U.M.) is a minor protagonist that appears in the Bricking Beginning arc.

Bricking Beginning Arc
Mentally Unstable Mineral appears once he finds out that Viavolo has been BRICKING Viorno Viovanna. He arrives to aid Viorno only to find Viavolo laughing from between reality and the BRICKED Realm. Upon seeing this, M.U.M. punches Viavolo and causes him to fully fall into the BRICKED Realm. It is unknown as to whether or not M.U.M. played a role in rescuing Viorno from the Splitty Aparty Realm.