Susie Swanson.
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.
Nobody, because there's no such character named Louis in Family Guy.
Nobody. Debra Jo Rupp has never voiced a character on Family Guy,
Brian
Stewie!
There is no character named Louis on Family Guy so your question cannot be answered.