|Age||Unknown, possibly 11-13|
Eugene Ellis is the president of the Student Council as of The Third Wheel. His speech was that if he was elected as president, he would replace all the school's toilet papers with Pillow-Soft Ultra toilet paper. He did not hand out lollipops or post posters to buy votes, so children didn't take his speech seriously at first. However, after his speech (which according to Greg was only 30 seconds long), the children realized that they have problems with the toilet paper in the bathrooms so they voted for him and therefore he became the president. However, when he won, Mrs. Birch said that it would be too expensive to stock all toilets with expensive toilet paper, but Javan Hill found the teachers using the expensive kind. As a result, Mrs. Birch sets up a plan where kids can bring their own toilet paper, though this is short lived since the school starts limiting the amount to five squares. During the brainstorming for a class fundraiser, he suggested that he will have a pro wrestling match in the gym while Javan Hill came up with the idea of motocross stunt show. But they couldn't decide which idea they liked better, so they settled on a mixed motocross/wrestling show. Eugene told the vice president, Hillary Pine to decide, she made a Dance Committee and they a few "small changes" to the original idea. Somehow the motocross/wrestling morphed into a Valentine's Day Dance. Eugene and Javan wanted to change it back to the motocross/wrestling event, but Mrs. Birch said that they must respect her decision. Greg said that Mrs. Birch disagreed with the Motorcycle-Wrestling was probably because she wasn't crazy with motorized vehicles in the gym to begin with.
- He could be the brother of Peyton Ellis since they both have the same last name.
- Diary of a Wimpy Kid: The Third Wheel (First and only appearance)