In the 'Genius Backup Fanfic', if Arnim Zola is alive, he could be a catalyst for a lot of events. He might be the one who discovers a new form of power or technology that everyone in the fanfic is after. His actions could drive the other characters to make certain choices, either to stop him or to join him. He could also be involved in some sort of political or power struggle within the world of the fanfic, using his wits and his knowledge to gain an upper hand. And, given his character, he would likely be causing a lot of trouble for the protagonists while trying to achieve his own self - serving goals.
If he's still alive in the 'Genius Backup Fanfic', he could be a mastermind behind some sort of evil plan. Maybe he's using his scientific knowledge to create chaos or manipulate other characters.
He might play a mentor role to some of the younger or less experienced characters in the fanfic. Despite his villainous nature, his intelligence could be used to teach them about certain scientific or strategic concepts, all while secretly planning something devious. Since he has a long history and a lot of knowledge, he could be a key figure in a complex plot, perhaps even forming alliances with unexpected characters to achieve his goals. This would add a lot of twists and turns to the story.