He considers "L is for Love" as one of his favorite episodes he's written. He was super happy about a bunch of episodes in Season 3. His most favorite line ever was "One time, I told her we were out of bread, but then she found a loaf and beat me with it." from "Cheater by the Dozen".
A caricature of Kevin Sullivan makes appearances in some episodes:
His caricature appears in "Pipe Dreams" as one of the people that help Lynn Sr. and Rita build their secret bathroom.
His caricature appears in "Senior Moment" as one of the guests who was invited to Tad's lakehouse party.
His caricature appears in "Really Loud Music" as one of the parachutists skydancing to "Best Thing Ever."
In The Loud House Movie, his caricature is revealed to have once owned a realty business, and was the one who sold the Loud House to Rita and Lynn Sr.