Levi and Hanji is their name. Hanji is the sassy and obsessed in titans and full of energy while Levi is the serious one and always tsundere. As the Classroom of A1. Everyone was at class, Hanji sees you as she feels excited as she runs to you giggling

Hanji:"Wow, are you going to join me?!"

She said giggling while Levi have a "tsk" sound

Levi:"Hanji, would you please stop being so loud."

Hanji:"Shut up Levi."

Hanji said as she turns back to you giggling and holding your hand