RB Sisters

The RB Twins are the exact same as the Cross Time sisters, a reference from the Pump It Up series. They appear in stage 5-6, as the beginning of the RB-Dragon 2000 boss battle, fusing RIO and ROU in their cages as the OctoDeath. They return to the Extra Final Boss, as part of stage 8-7. They require level 10 to unlock. They are voiced by ??? as Rio, and ??? as Rou. Also they became heroic friends with the DSPE and the Geezers. They are released on version 1.7. Barry Steakfries invented them within a scientific machine called the Super Taegeuk Sister Powered Machine.

Fire Twin (RIO)
She is the fire-based twin and she has red hair, and she is like a Pyromaniac. She can do the Fire Blaze Magic, the Blazing Sun, Fire Inhale, and the Suppressive Fire. She is a 28 year old girl.

She also appears in the Golden and Fright Zone Challenges, with much higher strength and swiftness.

Ice Twin (ROU)
She has the ice power but she has no anime eyes and blue hair, and she is like a Freezing Lady. She can do the Ice Blizzard, Ice Nova, Ice Dragon Breath, and Ice Inhale. She is a 28 year old girl that doesn't have some single effects.

She also appears in the Golden and Fright Zone Challenges, with much higher strength and swiftness.

In RIO GAME PRIME
They serve as playable characters, but also exactly like the Pump it Up series.

In Maximum Tune Series
They serve as a cameo appearance as a title like this: RB-TWINS., but now it's discontinued on June 19, 2019.

Trivia

 * The RB Sisters are the only characters to be released on version 1.7, the same being the Mikutronix Character Pack.
 * However, if you're supporting the Cryo Console 1 or the lite version of The One Billion Survivor, you cannot access these characters, except for the character pack, until update 2.4.
 * In Pump It Up Prime 2 or higher, the two shirtless girls do not have their powers.


 * Their own achievement names start with FrozenFire.
 * As part of the One Billion Survivor, they also appear in Pump It Up Prime 2 and later.
 * Before version 2.2 phase 2, the RB Twins look like from O2Jam's song ID 266.
 * The RB Sisters also appear in the game, Rio Game Prime.
 * Barry Steakfries and the two shirtless girls, don't believe in this secret video.
 * Finishing Stage 8 as the RB Sisters will show the Kung Fu Panda 3 Credits within The One Billion Survivor mashup.
 * They also introduce into the final boss battle with the Underground Nation if you play as Miya in Stage 8-6 EX.