Sandbag, an example of background character on Waiting Room in Super Smash Flash 2.
Background characters are minor characters in the Super Smash Flash series 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.
With the severely limited stage selection of Super Smash Flash, the game only had one background character in its eight stages, but Super Smash Flash 2 includes many background characters in its large and growing list of stages.
In Super Smash Flash[]
Whispy Woods appearing on Dream Land.
- Whispy Woods appears on Dream Land's background. Unlike his appearance in the original Super Smash Bros., he is merely a cosmetic addition and does not blow wind.
In Super Smash Flash 2[]
ＣＬＥＯＤＢＯＴ appearing on the Waiting Room Halloween theme.
- Waiting Room has multiple background characters that appear in its several designs.
- On Waiting Room's normal variant, Sandbags appears on both couches. The one on the left couch stands and occasionally blinks, and the one on the right couch lies down and sleeps on it. There is also a mini Sandbag sitting next to the one on the left couch and there is another Sandbag leaning against the right couch wearing a pair of sunglasses.
- On Waiting Room's Halloween theme, a Boo can be seen floating above the left couch. There is a dizzy Sandbag spinning next to the left couch. ＣＬＥＯＤＢＯＴ also appears for a brief moment on the televisions as they transition from a spooky face to the SSF2 logo.
- On Waiting Room's Christmas theme, Sandbag is wearing a Santa hat and can be seen jumping happily on the left couch. There are two mini Sandbags jumping on the right couch also wearing Santa hats.
- On Mushroom Kingdom, Koopa Troopas are walking back and forth on the platforms in the background. Also, a Buzzy Beetle is bouncing endlessly on a spring in the background.
Bowser sitting and laughing on his throne next to Kamek.
- Bowser also appears in Bowser's Castle alongside Kamek if not present in playable form, spectating the battle and laughing when a KO is scored. Also, Lava Bubbles jump in and out of the lava in the back of the castle.
- On Galaxy Tours, a few Lumas are seen soaring around the Starship Mario. The Luma known as Lubba can also be seen in the back of the ship. In the Chompworks Galaxy, rolling Chain Chomps and two Octoombas appear.
- Pak E. Derm walks back and forth behind the trees on Yoshi's Story.
Mini-Neckies appearing on Jungle Hijinx.
- Multiple Mini-Necky flocks appear on Jungle Hijinx, flying from one side of the screen to the other.
- A sleeping Keyzer appears in Palm Tree Paradise's cave area.
- Jimmy T. appears during the Taunt! microgame on WarioWare, Inc..
- On Hylian Skies, a Fairy and a Duck appear in the Light World, while Irene, flying on her broom, and a bat-like creature appear in the Dark World.
- Zant observes the battle on his throne in Palace of Twilight.
Beldum appearing on Pokémon Colosseum.
- Magnemite, Bisharp, and Beldum can be seen in the background during the Steel transformation of Pokémon Colosseum. Dewpider, Cascoon, and Kakuna can be seen in the background of the Bug transformation. Drifblim can be seen in the background of the Ghost transformation.
Hitmonlee and Hitmonchan billboard on Saffron City.
- Butterfree, a trio of Pidgeys and Fearow can occasionally be seen flying across Saffron City in the background. There is also a billboard featuring Hitmonlee and Hitmonchan.
- Glaceon, Mamoswine and Regigigas appear in the background of Snowpoint Temple. Froslass occasionally flies across the background, behind the temple itself.
- If not in playable form, King Dedede can be seen flying across Dream Land in the background, from the left side to the right. A group of three Bronto Burts can also occasionally be seen flying in a wavy pattern in the background, from the right side to the left.
The audience members of Dedede's Arena.
- Several characters appear in the background of Dedede's Arena, mostly as audience members.
- One Batamon in the left stand.
- 13 Cappies, all in the middle stand.
- 12 Chillies on the left and right stands.
- 8 Flappers in the middle stand.
- Gooey on the right stand.
- Kabula, who flies outside the arena from right to left.
- 4 Knuckle Joes in the middle stand.
- 8 NESPs in the middle stand.
- 10 Noddies in the middle stand.
- 25 Poppy Bros. Jrs. across all three stands.
- Three Animal Friends: Rick and Kine on the left stand, and Coo on the right.
- 8 Scarfies in the middle stand.
- 8 Sir Kibbles in the middle stand.
- 11 Sparkies in the middle stand.
- 8 Squishies in the middle stand.
- 37 Waddle Dees, with 34 as audience members across all three stands, two as cameramen and one as the Commentator Waddle Dee.
- 8 Waddle Doos in the middle stand.
- 13 Walkies on the left and right stands.
- 5 Westers in the middle stand.
- 5 Wheelies in the middle stand.
- 9 Whiskers in the middle stand.
- On Crateria, a Geemer appears walking around in a tunnel, in the bottom platform's right (from the viewer perspective).
- Metroids appear in Planet SR388, flying across the background from off-screen.
- Giygas appears all throughout the foreground and background of Devil's Machine, moving endlessly across the stage.
- The Eggrobo can be spotted flying on Sky Sanctuary Zone's background from one side to the other.
- The four ghosts — Blinky, Pinky, Inky, and Clyde — roam across the maze on PAC-MAZE.
- In Chaos Shrine, a huge flock of bats 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 do not move at all other than scrolling from side to side.
- Fairy Glade has multiple background characters.
- Globox stands next to the bouncy mushroom and simply watches the fight, dancing when a KO is scored.
- Popolopoïs fly around the stage and rest on the giant tree.
- Small mushrooms stack on top of each other, helicopter bombs fly from one side of the stage to the other, and a warship flies off in the distance.
The Ginyu Force on Planet Namek.
- The Ginyu Force: Ginyu, Burter, Jeice, Guldo, and Recoome fly across Planet Namek from right to left at high speed.
The Straw Hat Pirates on Thousand Sunny.
- On Thousand Sunny, members of the Straw Hat Pirate Crew can be seen in the background. Except for Zoro, they all cheer upon a KO being scored.
- Roronoa Zoro is seen sleeping with his three swords alongside him.
- Nami stares at a piece of paper, while sometimes looking at the screen.
- Sanji is watching the fight while smoking a cigarette.
- Franky watches the fight from the left side of the ship’s deck.
- Nico Robin is seen reading a book on one of the staircases.
- Usopp is cheering for the fighters by raising his fists in a pattern.
- Brook plays music from his guitar on the staircase's railing.
- Tony Tony Chopper simply idles while watching the fight.
- Jinbe watches the fight from the right side of the ship’s deck while his arms are crossed.
The ninjas of Konohagakure on Hidden Leaf Village.
- Hidden Leaf Village has multiple background characters.
- Chōji Akimichi is seen sitting at the Ichuraku Ramen bar, eating a lot of ramen.
- Gaara is seen left to the bar.
- Hinata Hyūga will occasionally lean out from the right side of the bar.
- Ino Yamanaka is seen sitting at the bar, two seats away from Chōji.
- Kakashi Hatake is seen sitting on the Ninja Academy's rooftop, reading a book.
- Rock Lee is seen doing one-handed push-ups in front of a flower shop.
- Sakura Haruno is seen on the bar's rootop.
- Shikamaru Nara can be seen snoozing on the bar's rooftop.
- Smashville has multiple background characters: Blathers, Celeste, Label, Mabel, Mr. Resetti, Sable, Tom Nook, and male and female Villagers. K.K. Slider appears on every Saturday night. They watch the battle and react to KOs being scored.
- Captain Viridian is seen on Nintendo 3DS stage's screen during the VVVVVV game, changing the stage's gravity.