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'.
The following are the recommendations of a few anime master apprentice novels: " Raising a Disciple to Cultivate ": This was a classical Xianxia novel, which told the story of a master and his cute disciple on the path of cultivation. 2. [My Apprentice Is Very Arrogant]: This novel tells the story of an evil master and his arrogant apprentice. These novels all have plots about anime masters and apprentices, which can meet your needs.
A 'aokiji wins fanfic' is essentially a piece of fan - created fiction focused on Aokiji's victory. Fanfics are often written by fans who want to explore different possibilities for their favorite characters. In this case, Aokiji could win in various ways. He might outwit his opponents, or he could have some sort of new power - up that allows him to win a difficult situation. It could also be a story where he wins the hearts of the people around him, becoming a more respected and beloved character in the fan - created narrative.
Aokiji Robin fanfics often focus on their contrasting personalities. Aokiji is usually depicted as calm and detached, while Robin is more mysterious and knowledge - hungry. So, these fics play with how they interact given these differences.
The obvious main characters would be the animator and the animation itself. The animator could be a young, creative person who is just starting out and is still learning how to control their creations. The animation could be a simple character that was initially designed to be a friendly helper but then turns against the animator.