Palette Swap: A breakdown can be found here starting about 6 hours in. You can also watch this video.
7: Past!Filia (before Samson)
8: The Double!Cerebella palette fought in Cerebella's Story Mode.
2: The Double!Peacock palette fought in Peacock's Story Mode.
6: Lucky, the mascot of Lucky Charms cereal
7: The pajamas from her Story Mode opening.
7: The fencing outfit from her Story Mode ending.
8: The Egret color scheme.
18: Samus Aran
's Justin Bailey outfit from the original Metroid.
(Parasoul's sister Umbrella has the same color scheme, but this palette has Fluttershy's blue eyes instead of Umbrella's pink ones.)
7: Brain Drain
11: Day of the Dead (Mexican holiday) colors
4: Nurse Hallow
5: Nurse Patty
6: Nurse Easter
7: Skullgirl coloring from Valentine's Story Mode ending
8: Nurse Christmas
2: Squigly (Double has the right colors when she morphs into Squigly in her Level 3 super)
4: Based on Double's old design.
5: Umbrella (see Squigly palette)
7: The "stomach" colors from her story mode ending.
8: Based on Double's character poster.
11: Neapolitan ice cream
12: Ms. Victoria (meaning that if you do Double's Level 3 super, she'll actually have the correct colors when she morphs into Victoria)
13, 14, 15, 16: Water, Silver, Gold, Blood
20: The Skull Heart
21: Christmas Tree
7: How she looked when she was alive.
A palette based on Earthworm Jim
was removed; Alex wasn't satisfied with the way it looked.
5: New Orleans Saints
15: Original, based on military uniforms
21: Big Pimpin'
(Who started out as a buffed headswap of Ryu and Ken)
7: Bloody (from Eliza's Story Mode)
16: Faye Valentine
; Albus as Spike Spiegel and Horace as Jet Black
18: Ragyo Kiryuin
; Sekhmet as Life Fibers, Albus as Rei Hōōmaru and Horace as COVERS
; Sekhmet as The Process
14: Sexy Firefighter