Higesura appears as a recurring slime character with a standard blue gelatinous form and white eyes, uniquely distinguished by a thick mustache. This slime is one of many tamed by Yuji Sano, collectively inhabiting a discovered library where they read grimoires. Their shared reading allows Yuji to rapidly absorb knowledge and magical skills, facilitating his acquisition of the Sage class. Higesura shares a bond with Yuji enabling sensory exchange and mutual understanding, functioning primarily as a supportive entity within Yuji's expansive slime collective.