I found a manga called Mushoku Tensei - Isekai Ittara Honki Dasu , it's slow to update but it's fun to read.
It's about man who is reborn in magical worlds, really reborn. However, it retains his wisdom from when he was alive in Earth just like us. He had issues, was shuttin but died saving someone else. Manga is bad on novel, but despite it being little Ecchi, its funny and pretty well done for what is.