<P> Trixie is a blue toy Triceratops . She chats online with "a dinosaur toy down the street" who goes by the name "Velocistar237 ." She becomes best friends with Rex during the credits, playing cooperatively on a computer . </P> <P> Trixie reappears in the short films Hawaiian Vacation, Small Fry, and Partysaurus Rex, and appears in the TV specials Toy Story of Terror! and Toy Story That Time Forgot . </P> <P> Voiced by Jeff Garlin </P> <P> Buttercup is a white unicorn with a yellow mane and a pink nose . Despite his appearance, he has a very gruff voice and sarcastic personality . He is the first to introduce himself to Woody when Bonnie brings him home . He later appears at the end of the movie, now very close friends with Hamm . </P>

Who plays the unicorn in toy story 3