Rex Powers is Robbie's ventriloquist dummy. Since Robbie is too shy to speak for himself most of the time, he talks as Rex. He is Robbie's possible cooler alter ego, in fact. Rex has no filter.He does not like to be called a "dummy" or "puppet." He says what's on his mind and doesn't hold back or beat around the bush. He hits on every girl at Hollywood Arts but claims he never hits on Cat because she is weird, for example, calling her "still a mess" in Beck's Big Break. This is odd because Robbie is claimed to like Cat. Rex also claims he never hits on Jade because she's scary, although he has hit on her a couple times. In the episode Rex Dies, he gets sucked into a wind machine and is taken to the hospital (even though he's a puppet). Rex is shown to have a huge crush on Tori and constantly hits on her, although she is annoyed by this. In Sleepover at Sikowitz's, Tori kisses Rex when he hits on her. Rex is sometimes seen slightly moving or talking when not being held by Robbie, hinting he may not be a puppet. An example is in The Birthweek Song, Tori is trying to find her sister a birthday present and Rex shouts from inside Robbie's book bag, "Just get the girl the massage helmet!". Tori quickly responds by kicking the bag and Rex yells in pain, "Ah, my ribs!", but that may just be a ventriloquist trick. Another example is in Beck's Big Break when Robbie is going to get him out of the drawer in the guidance counselor's office and he shouts from inside the drawer, "Hey, don't you knock?". Rex is voiced by Jake Farrow, who is uncredited for the role (all puppetry is still done by Matt Bennett). Rex has appeared in every episode to date, except the second part of Freak the Freak Out, the second part of Locked Up, in Car, Rain, and Fire, The Blonde Squad, Wanko's Warehouse, The Hambone King, and Opposite Date. In "Blooptorious", he claims to be "Christopher Cane", a British actor.
Sometimes Rex along with Andre Robbbie Cat Jade Beck and Trina visit tori and the cyberchase fighters and go on adventures with them.