Rexxie is a female T-Trux who looks exactly like Ty Rux except she has a different personality, and is voiced by Rebecca Shoichet .
She appears in episode "Opposites" and is Ty's opposite. Unlike him though, she is anything but a born leader and has poor fighting skills which seems unnatural and weird considering she's a T-Trux. Other than fighting skills she also lacks strength that Ty, D-Structs and D-Stroy are shown to have.
Also, unlike other introduced T-Trux, she has rather uninteresting personality and her character doesn't seem to have a goal. She's presented as someone who's fairly uninterested in everything that's going on. She isn't too keen on fighting for what's right according to her like Ty nor does she have an ideal that she aspires to achieve like D-Structs and D-Stroy do.
She is one of the members of Rocksie's gang and in "Opposites" she helped Ty's gang by pretending to be Ty in order to fool D-Structs and D-Stroy.