Well, there's a fanfic called 'The Shining Aoyama'. In this one, the reader is a new student at UA and Yuga is immediately drawn to their unique quirk. It's a really sweet story that shows how Yuga's flamboyant personality can be both endearing and a bit of a challenge in a relationship. It has some really nice character development for both the reader and Yuga.
A great 'buddyfight yuga fanfic' should have a strong plot. For example, it could involve Yuga going on an exciting adventure, like exploring a new area in the Buddyfight universe. It also needs to stay true to Yuga's character. He is known for his determination and love for Buddyfight, so these traits should be prominent.
I'm not sure of a specific fanfic about them off - hand. But you can try searching on popular fanfic platforms like Archive of Our Own. There might be some really interesting stories there that explore their relationship, whether it's a friendship - centered one or something more adventure - based with them teaming up in the My Hero Academia universe.
Aizawa is still going strong in the manga. There's no event or storyline that has resulted in his death. The creators have chosen to keep him as an active character.
The contrast between their personalities. Aoyama is flamboyant and Tokoyami is more reserved. When these two are paired in a fanfic, seeing how their different ways of thinking and acting play off each other can be really engaging.
One great 'buddyfight yuga fanfic' could be 'Yuga's New Adventure'. It takes Yuga on a journey to a new world within the Buddyfight universe where he has to face unique monsters and challenges. Another is 'Yuga and the Lost Cards' which delves into a mystery involving some long - lost Buddyfight cards that only Yuga can find and unlock their true power.
The students of Class 1 - A are often involved. For instance, Midoriya might be portrayed as being unjustly treated by Aizawa, and the fanfic could focus on Midoriya's struggle against Aizawa's supposed unfairness. Bakugo could also be in the story, maybe being in conflict with Aizawa's disciplinary actions.
There's also 'Dabi and Yuga: A New Alliance'. In this fanfiction, they team up against a common enemy. The story is full of action and their interactions are really well - written. It shows how they can rely on each other's strengths.