Timantha wears a bright pink shirt, white boots, pink skirt, a headband with a bow & pink earrings. Like her twin brother, she has brown hair, blue eyes, and buck teeth. Timantha's voice is much higher than her twin brother's, and sounds similar to Bubbles from the Powerpuff Girls, albeit slightly lower. As a teenager, her voice is similar to Harley Quinn from the Arkhamverse and other DC medias. As an adult, Timantha's voice is similar to Ashi from Samurai Jack or Ilana from Sym-Bionic Titan. Aside from being the youngest, Timantha is slightly taller than her older twin. Her skin tone is slightly darker than Timmy's.
After High School, she had dental surgery and removed her buck teeth, replacing them with normal teeth.
Timantha has almost the same personality as Timmy, except Timantha's personality is more girly & organized. She's smarter than her twin brother, and is nowhere near as selfish as him. Like Trixie Tang, Timantha cares about her looks and likes staying pretty, and has a hidden talent of being a good cook, where the food tastes better than it looks, inherited from her mom. She also has a crush on Sanjay.