Shijou Saikyou no Daikenja, Tensei-saki ga Nuigurumi demo Saikyou deshita the Comic

Ralph, a legendary sage, has used up all of his power to seal the Demon King and has been reincarnated 300 years later. However, he finds himself reincarnated as a stuffed animal. He and Tiana, a beautiful girl who wants to be a wizard, decide to become the strongest again, but an unexpected evil hand is closing in on their peaceful territory. So a fantasy with infinite cuteness, full of courage and magic, begins!

(Source: Micro Magazine-sha, translated)