The cool factor. Batman has a lot of cool gadgets and a mysterious persona. Jack, as a young character, might be attracted to that. He could see Batman as a role model in terms of being unique and having an edge in the fight against evil, which could translate well into his own experiences with the Autobots in the fanfiction.
In fanfiction, the possibilities are endless. Regarding Jack from Transformers Prime being a Batman fan, it could be a really cool concept. Imagine Jack looking up to Batman as a symbol of justice and using some of Batman's strategies in his own encounters. He might be inspired by Batman's use of gadgets and apply that thinking to his interactions with the Autobots. For example, when they're facing a difficult situation, Jack could draw on Batman - like tactics to help come up with a plan. But again, this all hinges on the creativity of the fanfiction writer.
One reason could be the allure of power. Unicron is an extremely powerful entity, and Jack might be attracted to that power. Maybe he feels that the Autobots' power is not enough to deal with the threats they face, and he sees Unicron as a potential solution. Another reason could be a sense of rebellion. Jack might be tired of the Autobots' rules and way of doing things, and Unicron represents a break from that.
Maybe he runs away because he's afraid for his family's safety. In fanfiction, it's possible that the Decepticons target Jack's family to get to him or the Autobots. To protect them, he decides to leave and lead the danger away from them. He thinks that by distancing himself, his loved ones will be safe.
Yes, he could be in certain fanfictions. Fanfiction allows for a lot of creative freedom. Maybe the writer wants to show Jack's journey from being a Unicron fan to realizing the true nature of this evil entity. It can be a great way to explore character development. Or perhaps it's part of a more complex plot where Unicron has some sort of allure that Jack initially falls for, but then has to make a choice between his newfound interest and his loyalty to his Autobot friends.
One possible plot could be that Jack starts to have strange dreams about Primus. These dreams lead him to search for more information about Primus in the Transformers' history. He might then discover some long - lost secrets related to Primus that the Autobots themselves were not aware of, and this knowledge could put him in a dangerous position as there could be Decepticons or other forces that don't want these secrets revealed.
Well, in such a fanfiction, perhaps Jack discovers an ancient relic that bestows upon him the power of a Prime. He then has to learn to control this newfound power while facing off against old enemies of the Autobots. Maybe he teams up with Optimus Prime and the others, using his unique human perspective to come up with strategies that the Autobots hadn't considered before.
Yes, there are likely some out there. Fanfiction often explores unique character combinations and interests. You can start by looking on popular fanfiction websites like Archive of Our Own or FanFiction.net.
One possibility is that Jack gets into some sort of trouble because of his admiration for the Predaking. For example, he might be mistaken for a threat by other Autobots who don't understand his interest. Or he could be targeted by Decepticons who think they can use his knowledge or access to the Autobots through his connection to the Predaking - related things. Also, it could involve Jack's attempts to make peace between the Autobots and the Predaking, believing that the Predaking could be an ally if properly understood.
Perhaps he runs to an abandoned military base. In the Transformers Prime world, there could be old military installations that are no longer in use. Jack might see these as a good place to hide, as they may have some remaining defenses and resources that he could use to protect himself while he figures out his next move.
Well, it could be about Jack initially being scared of the Dinobot due to its large and intimidating form. But as the story progresses, he discovers the Dinobot's noble nature. Maybe they team up to fight some common enemy in the Transformers Prime universe.