Rein is one of the hundred mamodos striving to become the Mamodo King. Despite his intimidating looks, he possesses a kind and compassionate nature. His ambition isn't to claim the throne; instead, he aims to assist his shy bookkeeper, Kyle, in overcoming his fear of confrontation with others.
Rein has a unique ability that allows him to shift his appearance between that of a bear and a human. This distinctive trait sets him apart from other mamodos.
During the intense battle against Clear Note, Rein emerges when Zatch's book transforms into gold. This encounter marks a significant moment in their journey.










