Trixie Tang's role, in her debut episode, is the popular cool girl. She first appeared when she walked to the bus. The bus driver introduced her to the kids. She walked to the popular kids Tad, Chad and Veronica. When she passed the unpopular kids, she called them empty bus seats. When Timmy wished that he become popular, Trixie was impressed, but Veronica was very suspicious of him declaring it's a trap. Later at night, Timmy gave up his popularity and confessed everything. When Chad invited everyone except Timmy, Chester, A.J., and Elmer to his yacht, Trixie quickly walked back to Timmy saying that Timmy was nice to reveal the truth. She even kissed him in the cheek, before joining the party on the yacht.
Timmy has made the biggest impressing thing for Trixie, but has backfired. A frustrated Timmy wish that the boys were separated from the girls, just to get away from Tootie and all the girls that laughed at him from his failure. After Timmy and Cupid changed the world back to normal, Trixie was actually pleased by Timmy's gift and wanted to be Timmy's Valentine. However, after looking at a sobbing Tootie, Timmy "regretfully" refused which made an impressed Trixie wanting to give Timmy lots of messages on his answering machine, especially during the Ending Title Card.
Trixie and her Dad with their Casablanca parody has lost the contest from Timmy's fish. After Timmy's wish to find Wanda, Timmy tries to make Trixie confess that she took Wanda, but after the pilot yells "No Pets Allowed!", Timmy sees that Trixie's clean.
Trixie is the main female lead in a school musical, preformed by Mr. Bickles. After Timmy and Chip Skylark had their voices back during the event of the episode, they both preformed the song Find Your Voice. When the song ended, Timmy asks a fed up Trixie to forgive him, but refuses.
Timmy wishes for a whole world to be a superhero comic book. Trixie has become Wonder Gal with speed, strength, and super popularity. An annoyed Trixie is not happy for the fact that Hawk Gal/Veronica is on her team.
After Timmy wishes to be the funniest person on earth, Trixie won't stop laughing at him. In addition, Timmy needs to save her from being eaten by the seemingly harmless plant. After Timmy killed it, Trixie frustratingly kicks Timmy out of her house.
She and Timmy are the last two people, other than Cosmo and Wanda, left on earth. Little did Timmy know, Trixie has a syndrome of wanting hundreds of boys to adore her. Timmy tries to unwish the wish, but Trixie is constantly in his space.
Trixie was impressed after Timmy made a sand castle with unnoticeable help, but Francis destroyed the castle and took Trixie away from Timmy. After Timmy's wish to be the strongest person on the beach, he accidentally crushed Trixie's bones. She was not seen from that moment onward.
Trixie is seen during the song, "Adults Ruin Everything" as one of the protesting kids. Notably this is the only time she appears alongside fan-rival Tootie. She is also seen delivering a pizza to Timmy after he becomes President. She is seen getting on the bus in, Unfundamentals. Later she is seen roller-skating, in the reprise Mix.
Timmy uses You Doo Dolls to clear Veronica, Tad, and Chad away from Trixie's lunch table so he can be alone with her. After getting to know him, Trixie is momentarily impressed, but Tootie unknowingly uses another You Doo Doll to make Timmy say she is prettier than Trixie, who dumps her lunch on Timmy's head and storms off.
Trixie is seen on a swing when Timmy attempts to get a kiss with her while wearing a love amulet given to him by Mark Chang. The amulet turns out to be a lie (part L of F.L.A.R.G.) and Trixie quickly screams for security to throw Timmy away. Trixie is later seen holding hands with Timmy in a photograph montage with other pleasant events that Timmy cannot remember due to amnesia (part A of F.L.A.R.G.).
Trixie played a brief role in the "The Big Beginning" after Jorgen whipped everyone's memory, Timmy yells out that he was in love with her since kindergarten. After the Lead Eliminator showed up, Trixie and the rest of the class took off, and wasn't seen onward.
In "The Exiting Middle Part" Trixie was briefly seen with her pet dog, and ran off after Timmy waved to her. Trixie was kidnapped by the Eliminators along with A.J., Chester McBadbat, Dad, and Mom and was shocked after seeing Timmy's fairies. Joining forces, she found Timmy and Mark Chang in the Blue Moon of Vegon. Before Timmy was sucked in The Darkness they both shared a kiss.
In "The Final Ending", after Timmy's wish of having the best day ever, Trixie and Timmy was about to share a kiss, but it was all an allusion from The Darkness. Inside the Timmy Cave. Timmy's friends, family and enimies were glad he's okay. Trixie and Timmy was about to share another kiss, but was interrupted by Mark. The Lead Eliminator shows up took Jorgen's magic and made Trixie and the rest dissapear. After Timmy's sucess, he and Trixies kiss were constantly backed off, and Jorgen confirmed that her memory along with everyone else will be erased and make everything back to normal.
Timmy Turner tries to ask Trixie out to the dance, but backfires. After Poof shoots Cupids arrows to her butt. She fell in love with Timmy, but he had a choice to either kiss her, or let his parents marry a rose bush, and his crazy teacher.
Timmy distracts Cosmo to add his own rules to the Da Rules book. One of the rules he writes, is that a godchild can use his/her fairy for love-related themes. He wishes for a crowd of Trixies who love him for who he is.
She was seen in the popular section of the bus on a pool with Veronica. Timmy uses his powers to be right to get inside and jumped on the pool. Timmy offers her a waffle, but nothing happen that moment on.
After Timmy wishes for non-stop desserts, this causes everyone to eventually become extremely fat. An obese Trixie is seen in Timmy's class eating a cookie, which due to her flabby belly and huge butt, causes her belt to break as she continues to happily scoff down her gigantic cookie.
After Cosmo becomes pregnant, a montage of him throwing up on Timmy is shown, during one moment he impresses her by trying to give her a flower but the moment is ruined when Cosmo throws up on him from above.