Salt Lamp is a character that was formerly up for debut in TPOT. They failed to join though, only receiving 2,039 votes, placing 10th. 
Personality:

Salt Lamp appears to be a happy camper, as they are mainly seen smiling for most of the time they are on screen. They aren't too fond of jokes and giggly nicknames, as they have an annoyed and angry expression when Two gives them the nickname "Salty Lampy", this could've also been from the fact that they weren't debuting though.