Background character/Removed background characters

Over the course of Super Smash Flash 2's demos, some background characters were removed, generally due to major changes in the stages they appeared in. Below is a list of removed background characters in Super Smash Flash 2, as Super Smash Flash had none.

Bee Blader
Bee Blader is a large bee-type helicopter Mechaniloid created for the purpose of transporting Ball De Voux. Built for guerrilla warfare they are suited for operations in the forest or city. Bee Bladers attack by firing their machine gun, launching guided missiles, and dropping Ball De Voux to assist them. If X attempts to stand underneath one as it falls from the sky in defeat, he will then be crushed.

In Super Smash Flash 2, a Bee Blader appeared on Central Highway during demos v0.7 to v0.8b before it received sprite tweaks in version v0.9a.

Cream the Rabbit
Cream the Rabbit is a character in the  universe. She is frequently accompanied by her friend Cheese. Originally living an idyllic life with her family, Cream had an encounter with Sonic the Hedgehog and his friends when the evil Doctor Eggman entered her world, and soon joined them on their adventures.

Cream is able to achieve flight by flapping her large ears. She is very polite, brave and well-mannered, although she can be childish and naive, too.

In Super Smash Flash 2, Cream appeared in the past stage Green Hill Zone as a background character, where she runs somewhat slowly across the loop. She was removed in SSF2 Demo v0.9a.

Mecha Sonic
Mecha Sonic is a robot modeled on Sonic the Hedgehog, created by Dr. Eggman. It is distinct from the well-known Metal Sonic. There have been several models of Mecha Sonic in various games of the series. Mecha Sonic has more of a sleek, thin appearance, with large gauntlets and a visor. When he curls into a ball, he becomes a spiky, sharp ball.

Mecha Sonic made his debut in Sonic & Knuckles, where Sonic fought him three times at Sky Sanctuary while tracking down the Death Egg. Knuckles the Echidna was still able to defeat Mecha Sonic, completely destroying him.

Mecha Sonic appeared as a background character on Sky Sanctuary Zone, along with Eggrobo. Mecha Sonic appeared broken into pieces and petrified. He was removed in SSF2 Beta 1.0, with the revamp of Sky Sanctuary Zone.

Piccolo Jr.
Piccolo Jr., usually just called Piccolo, is a Namekian and also the final child and reincarnation of King Piccolo , later becoming the reunification of the  after fusing with Kami. According to Grand Elder Guru, Piccolo, along with Kami-sama and Piccolo Daimaō, are part of the Dragon Clan, who were the original creators of the Dragon Balls.

A wise and cunning warrior who was originally a ruthless enemy of Goku, Piccolo later becomes a permanent member of the Dragon Team, largely due to forming a mutual respect to Goku and even more from forming a close bond with Goku's first-born son, Gohan.

In Super Smash Flash 2, Piccolo appeared as a background character on Planet Namek, alongside Vegeta IV, Son Gohan, and Trunks. Piccolo, unlike the other three characters, was stationary. He was removed in the Beta 1.1 version when Planet Namek was resprited.

Rosalina
Rosalina is the adoptive mother of the Luma race and overseer of the Comet Observatory. She was rumored to be an Assist Trophy in Super Smash Bros. Brawl, but this turned out to be false. She is a playable character while being assisted by a Luma in.

Rosalina has made 'protecting the cosmos' her mission in life. She is a loving figure, caring for her children diligently. She still misses her mother, who apparently died years ago.

In Super Smash Flash 2, Rosalina appeared as a background character in the Comet Observatory stage, in the front of the beacon. She was removed from the game, alongside the Comet Observatory, in SSF2 Beta 1.0.

Scurvy Crew
The Scurvy Crew are a trio of crab pirates who are boss characters in Donkey Kong Country Returns. The Scurvy Crew's leader is the red crab, Captain Greenbeard.

Prior to their boss battle, the Scurvy Crew have a major role during the level Peaceful Pier, where they ride a pirate ship, chasing after Donkey Kong and Diddy Kong. Throughout the level, they try to attack the Kongs with multiple bombs and an anchor, the latter causing their ship to crash at the end of the level.

In SSF2, they appeared as background characters in the Gangplank Galleon stage, standing on three islands. They were removed in Beta 1.0, when Gangplank Galleon's sprites got redone.

Sōsuke Aizen
Sōsuke Aizen (藍染 惣右介) is the main antagonist in the  franchise's Arrancar Invasion arc, where he tried to destroy the Soul Society using multiple Arrancar.

Aizen initially appeared to be a very kind, well-respected captain and was looked up to by many, especially his lieutenant, Momo Hinamori. However, this was just a mask to disguise his manipulative, and very dangerous nature. In truth, he cared very little for his underlings, and is willing to use almost everyone around him as pawns to achieve his goals.

In SSF2, he appeared as a background character on Hueco Mundo, standing behind three swords. He was removed when Hueco Mundo got an update in SSF2 demo v0.9b.

Tier Harribel and Ulquiorra Cifer
Tier Harribel and Ulquiorra Cifer appeared as background characters on Hueco Mundo, guarding Las Noches. They were removed when the background of Hueco Mundo got another tweak in SSF2 Beta 1.0.