Satoru Mikami [三上悟, Mikami Satoru] is the main protagonist of Tensei Shitara Slime Datta Ken. After death, he reincarnated as a Slime in a different world who was later named Rimuru by "Storm Dragon" Veldora.
His jokes lacked both delicacy or tact, and he was often told to keep his mouth shut.
After leaving college, he joined a major general contractor firm and lived alone till the age of 37, never having a girlfriend. Filial duty were left to his older brother, his life was essentially that of an independent, single noble. Neither short of height, or wanting of a good face; yet unpopular. He tried exerting effort into finding a girlfriend after confessing thrice. But after being dumped, his heart was left shattered.
He was stabbed protecting Tamura from a theft. Satoru’s “soul” linked with a spawned monster in another world. Into a dimensional crack so small that no eye could see. His soul linked with a mass of demonic energy. This mass was the origin of demons, and to Satoru who had linked to it, his thoughts as a base, the mass constructed a body. What is normally is essentially an impossibility with an astronomically small chance of occurrence, Satoru was reborn as a monster in another world.