Eyepatch Slime is a blue gelatinous creature distinguished visually by a single eyepatch covering its right eye. It belongs to a tamed group serving protagonist Yuji Sano alongside other uniquely marked slimes, such as variants with mustaches, scars, or leaf adornments. This slime lacks an individual name in available sources and is collectively grouped under Yuji's slime companions.

These slimes function as extensions of Yuji's abilities. Their amorphous, boneless bodies enable versatile combat and utility applications, including remote spellcasting. Eyepatch Slime participates in forming distributed magic circles for large-scale barriers or coordinated attacks. The slimes exhibit communal traits like enthusiasm and exuberant chatter, often displaying childlike curiosity. Yuji maintains a nurturing relationship with them, treating them as companions rather than mere tools. Its narrative role remains consistent as part of the collective slime unit supporting Yuji's objectives.