Responses
You might find something in here
https://www.mangago.me/home/mangalist/2687739/
Addlt Info ; This one is not transmigator ^ but the MC is OP ;) I will try to find mpre that fits ur description ^^
manhwas with op mc (probably transmigrator) who teaches a younger cast and bonds with them, found family style? like these:
https://www.mangago.me/read-manga/one_hit_teacher_master_baek/ (this one especially fits the bill)
https://www.mangago.me/read-manga/the_magic_tower_s_problem_child/
NO romance or ecchi/fanservice pls i'm begging