Rosti Nauman

Will's roommate, a male student who harbors strong affection for him, reminiscent of Elfaria. He is a skilled magic engineer who provided Will with magical tools. He can use water and ice magic. There are hints that he knows about Will's magic, and he remains a mysterious figure, including why he is so attached to Will.

During the "Boundary Festival" incident, he shielded Will from the powerful monster "Divende" and was pierced by the "Mage Slayer," disappearing in a manner that suggested his magic was erased, and he was presumed dead. However, on the day of the graduation ceremony, he was seen in an unscathed state watching over Will from the academy's wall as Will ascended the tower. After Will climbs the tower, he no longer appears.