He is a seal who tends to show up in typical seal locations (the circus, the beach, the zoo, the arctic) and annoy Pluto into chasing him, causing Pluto to get into dangerous predicaments. Salty typically saves him, leading Salty and Pluto to become best friends—until Salty's next appearance, when the cycle begins again.
Otherwise, Salty is just a mischievous little seal pup but means no harm to anyone, as he is mostly driven by his childlike curiosity. And even when he gets in trouble, he's slippery and clever enough to avoid it.
Salty's debut appearance came in Mickey's Circus (1936), in which he tormented Donald Duck. Pluto's Playmate (1941), Rescue Dog (1947), and the particularly famous Mickey and the Seal (1948) followed.
Salty shows up in one episode. Pluto's Seal Deal (1999) marked the first of Salty's more recent roles.
In an episode of House of Mouse "Snow Day", there's a big blizzard, which means that the House of Mouse is closed for the day... until Salty the Seal shows up, looking for some entertainment so Mickey and the gang put on a show for him.
Salty's most recent appearances are in Mickey Mouse Clubhouse. Salty made his series debut in the episode "Pluto's Playmate" where Mickey and friends helped Salty learn tricks for his upcoming circus show. He was later seen in the jungle in "Mickey's Fishy Story".
He appears on the Disneyland's Toontown "Toontown's Official Seal" in the City Hall and on Minnie's Offical Citizen Certificate in Mickey's Toontown Fair. Since Mickey's Toontown Fair was demolished to make room for an expanded Fantasyland in the 2010s decade, he's currently featured in the posters at Storybook Circus.
- Despite being a sea lion, he's always referred to as a 'seal', though he is not a true seal.