rimuru tempest リムル゠テンペスト , formerly known as satoru mikami, is the main protagonist of that time i got reincarnated as a slime.

partner and best friend of the true dragon veldora tempest, rimuru is the founder and king of the jura tempest federation in jura forest. he is one of the demon lords of the octagram. he lives in rimuru city, the capital city of the jura tempest federation .
rimuru initially appears as a blue-bodied slime, but upon becoming a demon slime, his body turns silver with streaks of gold.

Rimuru as a slime, since his body is androgynous, anything he mimics takes on an androgynous form of the respective creatures, while still bearing huge resemblances to the individual creatures as well.

his mass also grew over time, allowing him to accommodate larger mimicry forms without using extra magic to compensate for the additional mass. towards the beginning of the story, he only has enough mass to appear as a human child, but each time he consumes a foe powerful in relation to his current strength, his size in human form shows a notable increase.