Thomas Wagner (トーマス・ワグナー Tōmasu Wagunā?) is a 1st year Titan Junior High School student.
Thomas has blond hair with pronounced sideburns and light brown eyes. He wears the standard boys uniform of the school.
Thomas arrives at Attack Junior High School and is in class 1-4. He attends the first-year entrance ceremony.
Thomas, along with Nack, mock Eren's desire for chee-burgs. He later participates in the school's dodgeball tournament on Annie's team. During lunch time, he and the others in the team ask Annie to eat their share of mozuku seaweed.
Following a challenge by the upperclassmen, Thomas participates in the school's Sports Day games, teaming up with Armin, Conny, and Marco. In the last game, Thomas and his team lunge themselves at an opposing Year 2 team in order to save Eren's.
In the election for a new student council president, Thomas is present for the candidates' final speeches, and angrily reacts to Rico's presidential plans of forcing all students to clean the school on breaks, after school, and on non-school days.
In the school's 104th festival, Thomas participates in a Snow White play as one of the dwarfs, and later helps at Eren's chee-burgs stand. He flees when Titans appear and steal all of the food stands.
When teachers get in the way of Eren trying to head to the Titans' building to retrieve his chee-burgs, Thomas, along with his classmates stand up for him and come between them. He later watches Ilse Langnar's broadcast of Eren and the others venturing into the principal's office, and cheers once Eren manages to retrieve a chee-burg.