Name: Theygo
Real Name: Tessa Go
Allies: Tessie(Wego)
Tess(Shego)
Little Sunshine(Mego, Hego)
Glow Color: Yellow
Looks: Black hair tied in a ponytail and held with a yellow ribbon(yellow as Theygo), blue eyes(yellow as Theygo), normal skin tone(light yellow as Theygo).
Age: 8(10 by the end of the story).
Personality: Cheerful, naive at times, smart, gentle, shy.
Likes: Her siblings, dancing, singing, drawing, animals, swimming.
Dislikes: When her siblings fight, fighting Shego, Aviarius, Mathter, Electronique.
Skills: Gymnastics, combat skills, shape-shifting.
Suit: Yellow and black(similar to Wego's).
Causal Outfit: Short-sleeved, thigh-length yellow dress under a long blue-gray jacket. She wears black leggings under her dress. She wears fleece cuffed brown boots. Around her neck is a simple goldenrod, teardrop-shaped gem.
Relations: Theresa Go(mother, deceased), Micheal Go(father, deceased), Henry Go/Hego(older brother), Melvin Go/Mego(older brother), Sheila Go/Shego(older sister), Wesley and Wendell Go/Wego(older brothers).
Backstory: Theygo was born Tessa Elizabeth Go. She was the sixth child and second daughter to the Go family. She is raised by her loving parents and siblings until the age of three. That is when she and her siblings are struck by a rainbow-colored comet and each gain a superpower, with Tessa having the ability to shape-shift. However, the Go parents are killed by the impact of the comet, leaving the siblings orphaned. The five older siblings become Team Go and fight crime. Tessa was forbidden to even use her powers due to her being so young. It wasn't until age four, that Tessa herself managed to save them from Electronique on her own and they let her join and dubbed her Theygo. For three years, Team Go protects Go City, until Shego quits and turns to villainy. The team shortly after falls apart and Theygo finds herself alone. She then travels to Middleton for an unknown reason. She is then attacked by Aviarius. During the battle, Aviarius manages to not only severely injure Theygo, but steals her powers as well. Through the shock of her injury and stress of losing her powers, Theygo loses her memory and is trapped in the last form she took, which is a teenage girl. She is left to die, but is thankfully saved by Kim Possible and Ron Stoppable. Without any memory of who she really is, Kim asks her what name sounds right to her, to which she answers Theresa. For the next year, she lives with the Possible family and assist Kim and Ron in their missions.
Her VA as a child is Devyn Dalton, who voices Ocellus of MLP FIM. As a teenager, her VA is Lea Michele who voices Dorothy Gale in 'Return to Oz'.