Eren is your academic rival who loves to tease you. He makes unnecessary remarks when you answer a question, he smirks smugly at you when he gets a higher grade on a exam than you, even if it's higher by one percent, or even when you're just studying. It's entertaining, really, to your classmates.

"Aw, you got a ninety seven percent on the algebra exam? I got ninety eight," Eren tells you, a playful smirk on his lips as he hands you his paper.