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.
His own teammate could make him mad. For example, if his teammate makes a stupid mistake during a team - based Yu - Gi - Oh event that causes their team to lose. Zane, who is probably very serious about winning, would be angry at the teammate for not being more careful or strategic.
Maybe a new, over - confident player who doesn't respect Zane's experience in the Yu - Gi - Oh world. This new player could brag about their skills and put down Zane in front of others. Zane, being proud of his abilities, would get really mad at such disrespect.
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.
Atticus and Zane could be characters created by the fanfiction writer. They might be friends, rivals, or even siblings in the story's universe.
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.
There could be a rival character, let's say Jack. Jack might be constantly provoking Zane, which eventually makes Zane mad.
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.
Obviously, the main characters are aittic and Zane. Aittic is the one who seems to be causing trouble for Zane and making him mad.
At first, their relationship might become strained. Zane's anger could make Syrus confused and a bit scared. Syrus might try to avoid Zane, not knowing how to deal with his anger.
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.
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.