
Peter- ESFP

Louis- ENFP

Meg- ISFP

Chris- ISFP

Stewie- INTJ

Brian- INTP

Quagmire- ESTJ

Joe- ESTP

Cleveland- INFP

Herbert- ESTP

What do you guys think?
Honestly, all of the characters with the exception of Meg and Brian (being the closest ones to sane and realistic), go through many different personality types on the show, especially Peter.Peter: ENTP...a very narcissistic and stupid ENTP. (He has HIGH Ne)
Lois: ESFP
Meg: ISFJ (?)
Chris: Very dumb ISFP
Stewie: INTJ...though in later seasons he seems more ENTP
Brian: INTP
Quagmire: ESTP
Cleavland: ISFP
All types of people love alcohol and sex. As far as feeling like he needs to "live in the moment" that's more an Fi mood. Also, I'd say he's a type 1 Enneagram so he would aspire to include some type 7 enthusiast traits.In my opinion, Brian is a clear ISFP. I say this because he has a lot of morals that he will defend - he's a libertarian and hates Rush Limbaugh for going against his values. He has extroverted sensing since, let's face it, he loves his alcohol and sex. In the 100th episode special he also talks to Stewie about wanting to live in the moment which seems very aux-Se that is perhaps not developped as much as he'd like.