Answer:
"It introduces a character who contrasts with the main character."
Step-by-step explanation:
Todd is very different from Zoё, she is emotion-filled and tries to make a good impression, yet Todd is unresponsive towards her and hyper-focused like a robot, no show of emotion and unfriendly, per say. With that said, Todd contrasts heavily with Zoё, the main character.
Good luck and best of wishes, friend! :)