One Piece: A Plain Guy

It was just like any other day when a thought popped up in Ethan's mind.
"I decided."
He declared that day,
"I decided what I want to do. I want to be a pirate."
"...Dear lord,"
And his parents, on that day, shed a cold sweat,
"Have a mercy on us."
__________
What to expect in this fanfic:
- Overpowered MC. Like, One Punch Man level OP.
- Light read, no tragedy whatsoever.
- Heroine undecided, but not going with the conventional picks of Nami, Robin, Hancock, etc. Who knows? Depending on how things turn out, even a small harem may be a consideration.
- May or may not have Devil Fruit. Any ideas? (Only Paramecia though, I want to write something wacky)
- Am going to write some on this, and decide whether to go with this or continue [Struggle of the Weak] reboot ver.