NO HAREM. No contemporary/modern. No manga. No Manhwa.
This is just about male characters who are "powerful", but it's actually just people misunderstanding and attributing nonsense to them. Sometimes, they actually can produce crazy awesome phenomena but they don't believe they actually did it. They think it's all coincidences. Hell, the smarter characters thinks its coincidences until the coincidences gets to be too coincidental and they're converted too.
You may feel your favorite manga should be gathered together into distinct categories for your own reference and, now, you can do this with a LIST. After you've created your list or lists, you can proudly recommend them to other manga fans to showcase and share your taste in manga.
My Disciples are All Invincible Monsters