Galaxy Forms

Galaxies (aka Galaxy Warriors) are the type of characters that are similar with warrior forms from Guitar Hero Warriors of Rock, instead they're galaxy version instead. Nine characters are the galaxies. They are transformed from the original human characters for each encores, except for one who gets transformed at one of the higher ranks in Quickplay Mode.

Lars Umlaut
He is a red-eyed monster whose head is covered by a hair mask. This can be unlocked after reaching rank 75 in Quickplay Mode.

Midori
She is a cat-human hybrid, with green skintone, cat ears on her head that replaced her human ears, whiskers, and puffy hair. This can be unlocked after "Immortals" by Fall Out Boy.

Johnny Napalm
He is a teleporting chaos, with green lime skintone, white mohawk hair, dark green eyeball, green-blue eyes, and four spikes on each arms. This can be unlocked after "Disconnected" by Face to Face.

Judy Nails
She is a monster with red skintone, blue eyeballs, blue arms, and blown hair. This can be unlocked after "Beautiful Disaster" by 311.

Casey Lynch
She is a human-cyborg hybrid with gray robotic skin, and sci-fi bob cut. This can be unlocked after "Heart-Shaped Box" by Nirvana.

Pandora
She is a dwelling elf with dark blue skintone and super long hair with chimes. This can be unlocked after "Inside the Fire" by Disturbed.

Axel Steel
He is a fish demon with cyan fish skintone, dark yellow eyeballs, yellow eyes, and pulled back hair. This can be unlocked after "Beast and the Harlot" by Avenged Sevenfold.

Tamara Ford
She is a demon that has red skintone, dark red eyeballs, red eyes, hairy torso and arms, and poofed up hair. This can be unlocked after "Are You Dead Yet?" by Children of Bodom.

Izzy Sparks
He is a rare demon with light blue skintone, wings, tail, elf ears, white eyeballs without pupils, puffed-up hair, and satyr right leg. This can be unlocked after "Demon(s)" by Darkest Hour.

Trivia

 * Izzy Sparks had his makeup stayed after his transformation.
 * Galaxy Warriors are the names inspired from Marvel comic and film, "Guardians of the Galaxy".
 * Two songs that are opening and encore to Midori's tier are made up for Disney movie, "Big Hero 6". Also, Tier 9's opening song, "Unexpected Takedown" has the lyrics full of the characters in the movie.