-Reincarnation with memories since childhood
-training ahead proper age becoming OP (despite Rudeus is OP only locally, not globally)
-reincarnated into noble family
-adventure guild, rank system and dungeons
-obsession with Japanese food and baths
-multiple individuals transmigrating independently
Truck-kun of Isekai and othetwise loosers sacrificing themselves by jumping under it to save others
There should be more, but it's been long time ago I read it.