Mar would be the outsider and loner, the student that took things far too literal. She would shrug off what others have and not seem to be able to relate, likely giving the wrong impression that she believes she's better than everyone else. She's not popular enough to be the school's top dog, but she's not the lowest mutt there either. 

Lyn would be the actual popular kid. The one that gets along with everyone and seems the extremely happy, no matter what life tosses out at her. She's into making friends with everyone and actively in nearly everything she is asked to be in. However, she's not able to say no. This risks her life becoming overwhelmed with her choices and responsibilities, but she's too kind and doesn't want to let anyone down by saying she's not able to do it.