The following characters are considered non-canon as their official status remain unknown. This is due to the original nature of Skullgirls as being a project for Alex Ahad to place "fodder" characters.
4-Headed God

The 4-headed God is a being who only appears in concept art, and would have appeared in an area called Golgatha. Judging from its skeletal appearance, it probably had a connection to the Skullgirl.
Aesil

Aesil is a character who only appears in concept art. She is a being from a dreamworld connected to Earth and can summon monsters she created in her mind and control them.
An old LiveJournal entry confirms that Umbrella was supposed to be a spirit of her.[1]
Butterknife
Butterknife is a character who only appears in concept art. She is a sword collector from a faraway land who attempts to steal Samson's hairpin swords and Fuscienne's cross. Alex said she has no real connection to the story.
Fuscienne
Fuscienne is a character who is mentioned in an old Livejournal post by Alex Ahad.[2] She is a "black bishop" from the Chess Kingdom, who was sent to Canopolis to kidnap the princesses of the Canopy Kingdom.
St. George

St. George is a character who only appears in concept art. He would have used a Parasite by the name of "Bahamut," which are most likely the dragon parts to his outfit. [3] He is not to be confused with George Bomb.
Goldilocks
Goldilocks is a character who is mentioned in an old Livejournal post by Alex Ahad. Goldilocks has the power to adjust the size of her limbs. She is part of a small band of thieves consisting of her, Little Red Riding Hood, and Snow White, who were rivals to both the Fishbone Gang and Cerebella's performing group. Goldilocks and her friends aim to steal the Skull Heart.
Juju
- Main article: Juju
Myrine

Myrine is a Gigan who only appears in concept art. She bears a striking resemblance to Scythana.
Silverwind
Silverwind is a character who is mentioned in an old Livejournal post by Alex Ahad. She sought the Skull Heart to restore her dying ranch. She has fought alongside Annie in the past.
Spiderlegs

Spiderlegs is a character who only appears in concept art. She lacks the rest of her body past her torso and is connected to a Parasite with four legs.
The Triplets

The Triplets (Or the No Evil Triplets) are three mysterious characters seen only in concept art. They are a play on the phrase "see no evil, hear no evil, speak no evil", as this example:
- One can listen and speak, but can't see.
- One can speak and see, but can't listen.
- One can listen and see, but can't talk.
It has been said by Lab Zero staff that the Triplets currently have no place in the storyline, but "may be used in the future if a place can be found for them."