Perhaps in this fanfiction, Zane gets mad because someone cheats in a Yu - Gi - Oh tournament. He is a very competitive person and values fair play, so when he discovers the cheating, his anger flares up. He might then take it upon himself to expose the cheater and uphold the integrity of the game.
Maybe Zane gets mad when he loses an important Duel in the Yu - Gi - Oh world. It could be that he was so confident in his strategy but his opponent outsmarted him, leading to his anger.
It could be his rival. Rivals in Yu - Gi - Oh are always trying to one - up each other. If his rival manages to steal a rare card that Zane has been eyeing, or if the rival taunts Zane about a recent defeat, that would surely make Zane mad.
Maybe Zane gets mad because someone stole his special item. It could be a magical sword or a unique piece of technology in the fanfiction world.
In the 'aittic gets zane mad' fanfiction, it might be that aittic competes with Zane in a very unfair way. For example, in a contest or a game, aittic cheats but makes it seem like Zane is the one at fault. This would make Zane angry as he values fairness. Also, aittic could be constantly criticizing Zane's work or ideas without any valid reasons, which would also lead to Zane getting mad.
Well, maybe Atticus stole Zane's special item. That would surely make Zane mad.
Atticus and Zane could be characters created by the fanfiction writer. They might be friends, rivals, or even siblings in the story's universe.
One possible reason could be jealousy. Maybe Syrus is getting more attention in the fanfiction world, and Zane, being a proud character, doesn't like that. For example, if Syrus is praised for his skills while Zane feels overlooked, it can make him mad.
There could be a rival character, let's say Jack. Jack might be constantly provoking Zane, which eventually makes Zane mad.
Maybe Zane and Syrus get trapped in a strange virtual world created by some glitch in the digital system. They have to rely on each other's skills to find a way out. Zane's logical thinking and Syrus's knowledge of the digital realm might be combined to overcome the various obstacles like malfunctioning programs and security barriers.
In the fanfiction, if someone were to insult his dueling skills or question his abilities, that would probably make Zane mad. He takes his dueling very seriously and has a lot of pride in his skills. So any slights towards his dueling capabilities could set him off.
One possible plot could be that Percy gets mad because his friends don't believe him about a new threat he has discovered. He might storm off and try to face the threat alone, leading to all sorts of dangerous situations.