Any of the books have a Reincarnated MC interact with realistic children?

MCs who are reincarnated in a fantasy world are a staple of the genre.

I find most of them either:
1.) End up loner training junkies.
2.) Interact with other absurdly competent children and compete withe them in life and death situations.

The first just gets tedious. The second kind of defeats the purpose of having a Reincarnation story to me...if the other kids in this world act just as competent as him, why bother making it an Isekai? Why not write a story about a local?

Has anyone ever written a Reincarnation Isekai where the MC interacted extensively with normal kids? Where the MC takes on a parental or big-brotherly role? Where he ends up using his adult knowledge and cheat to rescue normal kids from a crisis? Where he aces tests designed for kindergarteners?