Red

Adelaide Thomas, also known as Red, is the Tethered counterpart of Adelaide Wilson aswell as the somewhat main antagonist and leader of The Tethered in and out of her group in the 2019 film 'Us'.

She is also the only one out of the doppelgängers that can use her voice to talk than just make noise, but being rashy, it was because the REAL Red had choked her.

History
In 1986, The Thomas family travel to Santa Cruz, California to take part in a festival at the beach. During their stay, Adelaide wanders away from her father and discovers a funhouse. Going inside, Adelaide is trapped in a room of mirrors when a storm knocks the lights off. While going through the mirror room, she finds a doppelganger of herself and without warning, the doppelganger attacks her, strangles her (along with possibly damaging her windpipe) to unconsciousness, and chains her to one of the many beds belonging to the Tethered while she escaped to the surface world. Adelaide is forced to live a terrible existence within the Tethered society, being made to eat raw rabbits, and performing crude mannerisms to a similar vein of her doppelganger. Eventually, the Tethered realized that she was different from them as she had her own mind and her ability to speak. From there, she was made the de facto leader of the Tethered, and Adelaide would spend the last thirty odd years formulating her revenge against her doppelganger for taking her life as well as to lead the Tethered on a mission to kill off their real world counterparts.

The attack happens on the night the Wilson family return home from the beach. Adelaide, now going by the name Red, tasks her Tethered family with dividing up the family while she gets to toy around with the Tethered Adelaide. After the family manages to kill Abraham and Umbrae as well as the Tylers' doppelgangers, they try to escape Santa Cruz only to find that several other residents had been slaughtered relentlessly by the Tethered who are now forming a line in reference to the "We Are the World" campaign that Red had watched years ago prior to being switched out. After Jason succeeds at tricking his Tethered, Pluto, into walking into the flames of a burning car, Red kidnaps him and takes him to one of the Tethered's secret facilities.

Death
Chasing her to the facility, the Tethered Adelaide gets into a fight with Red ending it by stabbing and brutally strangling her to death. Despite her death, her plan appears to have succeeded as the Tethered are last seen being observed from afar by the government.