Their relationship can be shown as a father - son type. Whitebeard being the protective and wise father figure, always looking out for Ace. For example, when Ace is in a fight, Whitebeard is there to back him up or give him advice based on his own experiences.
One idea could be exploring Ace's memories of his time training with Whitebeard. Maybe show some of the tough lessons he learned and how he grew closer to his crewmates through those experiences.
Another option is to join Ace Memories fan groups on social media platforms. People often share their favorite fanfictions in those groups. You can also ask for recommendations directly. Some fanfictions might be based on a particular aspect of Ace Memories, like a specific character relationship or a certain event, so it's great to get insights from other fans.
No, it's not likely to be a popular genre. Spanking - related fanfiction in general is a very niche and often not mainstream. And when it comes specifically to 'ace whitebeard spanking fanfiction', it's probably only appealing to a very small subset of fans who are interested in this particular and rather unusual take on the Ace and Whitebeard characters.
I'm not entirely sure specifically what that particular 'ace whitebeard spanking fanfiction' is about as it could vary greatly. It might be a fan - created story within the context of the Ace and Whitebeard characters where some sort of spanking - related scenario is imagined. However, this could be a very niche or even a rather strange and unorthodox take on the characters in the fanfiction world.
Some Reddit communities dedicated to Ace Memories might also have links or discussions about fanfiction. It's worth exploring different subreddits related to the topic to see if there are any good finds.
Izou is also a popular character in these fanfictions. His skills as a swordsman and his unique personality make him an interesting addition to stories. He might be involved in adventures with Ace or be part of a sub - plot. Thatch is another one. Since he was the cook, there could be fanfictions that involve him cooking special meals for the crew, including Ace, and there could be some friendly banter between them.
One popular ace whitebeard fanfiction might be those that explore their relationship as a father - son like bond. In many of these stories, Ace's growth under Whitebeard's protection and guidance is depicted. For example, there could be a story where Ace overcomes his inner demons with Whitebeard's encouragement.
I really like the fanfictions that involve Ace, Whitebeard and Sabo. They are such interesting characters. In many of these fanfictions, the relationship between them is explored in great depth. For example, how Sabo copes with having Ace as his 'brother' again after thinking he was dead. And Whitebeard's role as a father figure to them adds another layer of complexity and warmth to the stories.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of various fanfictions, including ace x whitebeard ones. Just search for the relevant tags on the site.