Yes, there are some great ones. You can start by looking on popular fanfiction websites like Archive of Our Own. Just search for 'raphael x leonardo' and you'll find a variety of stories with different themes and writing styles.
One common theme is rivalry. Given their status as great artists during the Renaissance, many fanfictions explore how they compete with each other in the art world.
The characters themselves are very iconic. Raphael's tough - guy exterior and Leonardo's more level - headed nature create an interesting contrast. In yaoi fanfiction, this contrast can be used to build tension and chemistry. Fans are often drawn to seeing these well - known characters in new and different relationships, especially romantic ones that go against the norm of just being friends or brothers. Additionally, the large and passionate fan base for the original works that these characters come from also contributes to the popularity of such fanfiction as they are eager to see more content featuring their favorite characters in unique ways.
Some other platforms that might have such fanfiction are FanFiction.net. However, the content there can be a bit more hit - or - miss. You might have to dig through a lot of different stories to find the good Raphael x Leonardo yaoi ones. Another option could be Tumblr. There are a lot of fan communities on Tumblr that share and discuss fanfiction, and you might be able to find some links or even full stories there.
One great 'Raphael x Reader Fanfic' is 'The Turtle's Heart'. It really delves into the relationship between Raphael and the reader in a very sweet way. The author does an amazing job of showing Raphael's tough exterior but soft heart when it comes to the reader. Another one is 'Raphael's Secret Love' which has some interesting plot twists and a lot of character development for both Raphael and the reader character. It's full of action and romance at the same time.
A really interesting leonardo x reader fanfiction to begin with is 'Reader in Leonardo's World'. It throws the reader character right into Leonardo's world, which is filled with all kinds of adventures. The author does a great job of making the reader feel like they are actually there, experiencing everything along with Leonardo.
A good 'Raphael x Reader Fanfic' should have a well - developed relationship. It's not just about the romance but also about how the two characters grow together. For example, if the reader character is shy at first and Raphael helps them become more confident, that's great character development. Also, the setting is important. Since Raphael is a turtle from the sewers, the fanfic should use that setting to its advantage, like having secret meetings in the sewers or rooftop rendezvous that are unique to their world.
One of the best moments could be when Raphael first realizes his feelings for the reader. It's a turning point full of tension and anticipation. Maybe they are in a dangerous situation, and he suddenly realizes he can't bear to lose the reader. It's a moment that shows his vulnerability beneath his tough exterior.
Adventure is another theme. The reader and Raphael might go on some sort of quest or face challenges together. This could be related to the world he comes from, like in a ninja - turtles - inspired universe, they could be fighting against villains together.
One common theme is the idea of protection. Raphael is often portrayed as being very protective of April. Another theme is the discovery of new feelings. Since they are from different 'worlds' in a sense, their relationship development can be an interesting exploration of new emotions.