In a lot of Ezekiel - centric fanfiction, the theme of isolation is quite common. After his transformation, he was kind of pushed to the side in the show. Fanwriters often explore how he deals with being alone and how he might try to reconnect with the other characters. Some fanfictions also play with the idea of him having special powers or abilities that he discovers during his time away from the main group. This can lead to all sorts of exciting storylines, like him using these powers to either help or hinder the other contestants in different scenarios.
A prevalent theme is his struggle with his identity. In the Total Drama world, he's been through a lot that has changed him. Fanfictions often delve into how he copes with that and tries to find his place again. There are also stories that center around his adventures outside of the main Total Drama plot. Maybe he has his own little side - quests or challenges that he faces, which can be really interesting to read about. And of course, there are fanfictions that just focus on his comical side, highlighting his unique personality traits in humorous situations.
One common theme is redemption. Since Ezekiel had some rough patches in the show, many fanfictions focus on him redeeming himself. Another theme could be his relationships, like his friendship or potential romantic relationships with other characters. Also, his transformation from a normal contestant to the 'feral' version of himself is often explored in different ways in fanfiction.