Yeah, Eric actually plays a large part in what goes on with his character. IE: Greg becoming a CSI, Greg's hairstyles and clothes, he has even said he wants everyone to be able to see Greg outside of work and maybe even his apartment and even seen a love interest for him (and hopefully one that isn't psycho lol), and with the decontamination shower in 4x4 he and Jorja Fox wanted to wear board shorts to suggest nudity. In the same episode, he didn't feel comfortable doing the scene where he makes a muscle in front of the mirror but did it anyway. He says he likes the way Greg has matured and he feels he's matured along with his character. He doesn't seem to think he has a sense of humor but I think any of us Greg/Eric fans can disagree lol.