Background characters are minor characters that make cameo appearances in their corresponding home stages, normally, without interfering in the battles. As such, background characters should not be confused with stage hazards.
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Rosalina stands in front of the beacon at the middle of the stage.
A few Lumas are scattered throughout the stage as well.
Worth mentioning, Starship Mario can be spotted in the background and is presumed to be piloted by Lubba, who is actually unseen.
Lava Bubbles jump in from lava in the back of the stage.
Firebars can be seen spinning around accompanying the Lava Bubbles.
A flock of Mini-Neckies flies by from one side to the other.
Rambi's Animal Crate can be spotted deep between the palm trees.
A pair of Kritters arrive in small boat and blast a cannonball on the stage. The boat will sink after blasting the cannon, taking both Kritters with it as well.
The Scurvy Crew frequently appear on small islands.
Pak E. Derm is walking back and forth behind the trees.
Jimmy T. appears during the Taunt! microgame.
Captain Viridian is seen on the Nintendo 3DS screen duuring the VVVVVV game changing the stage's gravity.
Tingle is carried by a balloon that can be used as an additional platform. Tingle will fall if the balloon is bursted.
The Moon slowly approaches the stage as it passes through numerous changes. When it is about crash, which leads to a harmful meteor shower, the "Song of Time" is played and the Moon gets back to its original position to repeat the process.
Arwings constantly fly by to eventually boost toward the horizon and disappear.
Being the namesake of the stage, numerous Mr. Saturns can bee seen here, including those that can be carried and thrown.
The Rope Snake is seen hanged on a clothes line.
A sleeping Red Bulborb lays on the back of the stage.
A Cloaking Burrow-nit can also be seen left to the Red Bublorb but far behind it.
A huge flock of bat are seen flying in the upper part of the stage.
The four fiends: Tiamat, the Kraken, the Lich and Marilith float by in the background. They are rendered in still images and do not move at all other than scrolling from side to side.
The Eggrobo can be spotted flying on the background from one side to the other.
Gaara is seen left to the Ichikaru Ramen Bar, bending some sand.
Itachi Uchiha teleports in to the plateau on the background, to later teleport out.
Chōji Akimichi is seen sitting at the Ramen Bar, eating a lot of ramen.
Shikamaru Nara can be seen snoozing on the Ramen Bar's rooftop.
Hinata Hyūga will occasionally lean out from the right side of the Ramen Bar.
Rock Lee is seen doing one-handed push-ups in front of Ino's flower shop.
Piccolo stands in the foreground witnessing the fight through the length of the match.
Vegeta, Son Gohan and Trunks fly across the stage from right to left at high speed.