I don't have enough context to determine exactly who 'garp' is. It could be a newly created character by the fanfic writer, or it might be a character from a relatively unknown story that is being incorporated into the 'ace fanfic'.
You could start by looking on popular fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. They have a large collection of fan - created works and there's a good chance you might find 'garp save ace fanfiction' there.
First, you need to create a compelling original character (OC). Think about their personality, backstory, and what makes them unique. Then, plan out the training regimen that the GARP will use. It could include things like martial arts training, survival skills, or leadership development. For example, if your OC is shy, the GARP could use group activities to help them build confidence during training.
Well, AO3 is a great place to find high - quality garp fanfiction. It has a well - organized tagging system, so you can easily search for Garp - related stories. Additionally, some Reddit communities dedicated to One Piece might also have links or discussions about good garp fanfiction. You can also try following some One Piece fanfiction blogs on Tumblr. They often reblog interesting and well - written garp fanfiction.
I'm not entirely sure specifically what 'garp save ace fanfiction' is about without more context. It could potentially be a fan - made story in which Garp tries to save Ace within the context of a particular fictional universe, perhaps related to One Piece.