Yeah the OG isekai is Micheal Jordan! He got transported into the world of looney toons! ๐คฃ
Not Jobless reincarnation, nor re: zero its our GOAT ๐๐๐ MJ!!! ๐๐๐
But do you know the very OG isekai character? its Lemuel Gulliver from gulliver's travels!
He got transported into a world of small people and it is a freaking novel published 17th century ๐คฃ๐คฃ