Mushoku Tensei: Isekai Ittara Honki Dasu, Re:Monster Recommendations
Both main Characters are reincarnated into a new world while retaining their memories.
This allows them to appear as geniuses and impress everyone.
Both also have magical creatures, magic and lots of RPG elements.
While Re:Monster is more like a RPG game, where they can level up their abilities and evolve into new classes, in Mushoku Tensei they have to train/learn their skills.