You're probably referring to Peter Griffin.Although, Chris Griffin, Cleveland Brown, Joe Swanson, Bruce, Carter Pewterschmidt, James Woods also have similar shaped cleft chins.
No such character exists on Family Guy
There is no mailman character on Family Guy
Nobody. Debra Jo Rupp has never voiced a character on Family Guy,
555-0143. That's what his left butt cheek says, anyway.
No Chris Left Behind
No such character exists on Family Guy
There is a character named Lois in Family Guy.
There is no mailman character on Family Guy
Meg
Son
There is no existing Family Guy character 'inside' the suit. The Black Knight character is exactly how you see him.
Yes, he is the main character of Family Guy.
Road to Europe
Susie Swanson.
Nobody. Debra Jo Rupp has never voiced a character on Family Guy,
Nobody, because there's no such character named Louis in Family Guy.
Stewie!