File:RimuruBoth.png

Summary
The image is fromart from the manga and from (image URL:https://vignette.wikia.nocookie.net/tensei-shitara-slime-datta-ken/images/4/41/RimuruManga.png/revision/latest?cb=20190901095910)

Exact provenance unknown; ultimate image copyright by Kodansha. This is art from the manga that depicts the protagonist.