This is a fanart Rimuru Tempest Slime Form Sticker, that features the main protagonist of That Time I Got Reincarnated or Tensei Shitara Slime Datta Ken as a Slime and the reincarnation of Satoru Mikami. In his regular form, Rimuru takes the appearance of a usually spherical and sometimes amorphous mass of slightly blue and translucent ooze.