Brow Slime, also identified as Mayusura, serves as a tamed slime companion to the protagonist Yuji in "My Isekai Life." Its form appears as a typical blue slime with white eyes, distinctly marked by prominent thick eyebrows. Mayusura belongs to a group of slimes tamed by Yuji that developed unique traits through their connection to him. The slime's primary and defining characteristic is its powerful enthusiasm for consuming food.