Mr. Puff was Mrs. Puff's husband. He was caught and killed by humans and turned into a light bulb cover for a lamp.
His only physical appearance is in the episode, "Krusty Love," where he is shown getting turned on by a human hand with a pull switch, revealing him dead. When Mr. Krabs asks what happened to Mr. Puff, SpongeBob replies that Mrs. Puff does not like to talk about it.
- It's possible Mrs. Puff chose to keep her maiden name after Mr. Puff's death.
- In the mobile game SpongeBob Moves In!, one of the tasks Mrs. Puff can do is talk to Mr. Puff.