Kuroto

Once an ordinary blue slime, Kuroto's fate changed dramatically upon becoming the very first monster contracted by the protagonist Kelvin. Through a shared experience system and the relentless consumption of powerful foes, Kuroto rapidly transformed into the 'Slime Gluttonia,' a being whose combat prowess approaches that of a quasi-Demon Lord. Though incapable of speech, Kuroto maintains a mental link with its master, sharing emotions directly, and serves as an indispensable pillar of both defense and offense within the party.