I thought I'd challenge myself and do a little mannerism comparison between Ernie and Ronnie. Ernie's an Italian so of course he's got the big, exaggerated gestures. He's fun-loving and a big goofball.
Ronnie's an introverted grumpy little twat. But very jittery. I tried to express that here. XD Hope it worked.

Meme ->http://amberneely.deviantart.com/art/Fucking-annoying-poses-meme-144148217