HERE'S AN IDEA.
i'm giving this idea away to whoever wants it.
NEW MASTER
Okay. Kenichi the mightiest disciple/one piece crossover.
What if Kenichi had a master teach him before he went ryozanpaku and taught him his own martial arts. That martial arts is known as red leg/ or black leg.
If you haven't figured it out its Sanji.
Sanji teaches Kenichi a lot of what he knows including cooking.
Rules for Kenichi
No god like Kenichi. He still has to have no talent for martial arts except for red leg. Kick techniques are also an exception.
Kenichi still has to be the scaredy cat he is at first.
Can't be act like Sanji. Maybe. If you're gonna make him like Sanji then don't make him act like Sanji does when he meet's Miu, Renka, and Shigure.
Harem or not is up to you.
Body strength, upper part is weak, leg are not.
Kenichi's hiding the fact that he knows red leg from everyone at first
If he Smokes or not is up to you. If not then choose something else similar so he's like Sanji in some ways, like a lollypop or something
If you gonna include Sanji in the story then here are the rules for him.
Can't be a part of ryozanpaku at first. You can let him join later but only after Kenichi joins.
Nothing related to one piece except for him being taught by zeff and his dream.
Any pairing is allowed.
Also I just had another idea. Well two.
Optional: you could make Sanji Kenichi's father. Maybe, maybe not.
If you want you could use Zoro instead. Same rules apply
Story rules
no yaoi
Optional: No one else from one piece.
Ask if you need help.