Upside has a sort of gravitational energy flowing through her veins, hence her nickname.
Upside is technically a "simple" girl, wearing a basic blue t-shirt and red shorts. She has orange-ish skin thanks to the hot, dry climate on Venus. She often puts her blonde hair in a ponytail, because she says it lets her upbeat attitude out.
She is energetic, strong-willed, and very active. She usually looks on the bright side of a situation, and is almost always smiling.
Upside joins Umbra's team on Venus, where they must fight off invading Cosmotroops; however, they were actually sent by Nebula to create a diversion.
After the events of the game, Upside joins Umbra in his resistance against Nebula, with the help of Reverse.
Upside will return in the sequel, with an unknown role.