Jaryuu Tensei
Killed by car because of a stupid couple making out, MC reincarned as a Funny and powerful dragon. He is now leaving in the forest protecting slimes. That story sold me dreams before crushing them... The selling point was that he was a dragon in a RPG like world. But After changing to a human forms, this manga lost what makes it different. It is now a classical Isekai with an MC with OP power (since he is still a dragon inside). I hope he will switch back to his true form.
Maken no Daydreamer
College student died and was reborn as a strong sucubus' son (well that's not exactly it but it will be explained). Leaving in the wildness and training with only his mother and her beasts, she send him on an adventure after he became an adult. To see the world and discover his role in it. His mother was OP, he is OP too.
Re:Monster
Takarakuji de 40-oku Atattandakedo Isekai ni Ijuu Suru
Quite interesting MC won at the lottery and escaped to his family countryside mansion to avoid those after his money, since he is a really kind person. In his house, he discover a door connected to another world where culture and technology are middle age rate. MC brings tools and knowledge from his world to help the village near his door.
Shen Yi Di Nu
Isekai in a Wuxia world (no magic except Mc). A successful doctor was reincarnated in a girl with the same name, mixing both memories. While the body spirit owner died, mc promised her to get revenge for her. She also has the ability to access a pharmacy with medecines from our world. Mc is pretty, strong and super smart. Don't get on her bad side. She is also engaged, and her relationship with her fiance is beautiful (both are dangerous but care for each other). Lots of humour
Sayounara Ryuusei, Konnichiwa Jinsei