Isekai_enjoyer
Nerfing the MC by withholding Nen until he’s 17 is forced plot. It’s all to ensure he can’t escape before a certain point, keeping everything intact in the storyline. Based on previous statements from you, you’re going to just follow canon and the MC will even join the Straw Hats which leads me to believe the MC will just be a tagalong who will help Luffy. Rehash of canon with a MC who will babysit Luffy? Hundreds of fics like this.