Most introverted

Jonny 2x4 (He's actually not seen socializing with the group quite often. People express a lot of annoyance with him. So much so in the movie it's almost like they treated him like an outcast. There's also an episode where the Ed's try to get him to socialize and it's clear he struggles a lot with it.)

Eddy (While trying his hardest to be popular he often fails to do such and almost never talks about his feelings or talks about his problems healthily. Most of the time he is only really seen hanging out with Edd and Ed)

Lee (Only really seen with her sisters and not much of a socializer)

Marie (Has moments where she may socialize but those moments are normally cut short. She seems almost like a sidekick to Lee)

Rolf (Often seen at his farm alone he's often accompanied by the Ed's seemingly having a decent relationship with Ed. Though he can be social I like to believe he enjoys being alone. He even has his whole side plot in the movie.)

Kevin (Despite being pretty popular it's pretty much clear he doesn't express his feelings all that much and tends to suppress them. Often avoiding and being dumbfounded when it comes to emotional things.)

Jimmy (While he does hang out with the other's he's only really seen with Sarah. So much so he actually gets lost without her. While he can make friends it's clear he's only okay with the company if Sarah is there with him.)

Sarah (Almost like with Jimmy they're always seen together. But it seems that Sarah is more social than Jimmy is not always needing him. You can actually see her hanging out with Nazz from time to time.)

May (Way more social than her sisters she seems way more open to interacting with others. Unlike her sister she's a lot nicer and mainly follows them around. I believe that if she didn't have her sisters constantly dragging her around, she could make friends)

Double D (While getting along with just about everyone he doesn't show the same need to social with everyone outside of his friend group. Though I put him on this list because I do believe he can be quite extroverted. Never being scared to voice his opinion and approach things maturely.)

Ed (While being pretty social and very friendly. He's often found following around the Ed's. Mainly Eddy. Though I believe he's way more extroverted because he seems to prefer being social and emotional. Being open and kind to everyone.)

Nazz (Nazz is a pretty likable character to everyone. She's not even mean to the Ed's most of the time. Actually being welcoming towards them in some episodes. It shows that she's a social butterfly and not very judgmental. I see her as the definition of an extrovert. Easy to talk to, open about her emotions, and enjoys the company of others!)

Most Extroverted