Temmie Chang (born April 3, 1993), also known as Tuyoki, is an American video game animator, illustrator, and developer. She is best known for her work as the lead artist for the critically acclaimed indie role-playing game Undertale, in which she appears as a self-insert character who is also present in its follow-up, Deltarune. In 2018, she released Escaped Chasm, her first foray as the creator of an RPG maker game. In 2020, she released Dweller's Empty Path.

Temmie Chang was born on April 3, 1993, in Brooklyn, New York. Chang became interested in video game universes as a child watching her cousin play Breath of Fire. Around 2006, she began sharing her digital art on DeviantArt. She went on to study 2D animation at the Pratt Institute in New York.

Developer Toby Fox, a fan of her work, recruited Chang to work on art for his game Undertale. Chang was primarily responsible for its most complex elements, including cutscenes and several characters. Her most notable characters are the Temmies, a dog-cat mixture species derived from a sketch by artist Betty Kwong, named after Chang.

The widespread acclaim and commercial success of Undertale allowed Chang to pay off her student loans and gain notice for her work. She regularly works with the animation studio Yotta and has collaborated with video game developers WayForward and Team Meat.

Chang has released two RPG Maker games, including Escaped Chasm (2019), followed by Dweller's Empty Path (2020). Fox worked on the music for both games, while Japanese composer Camellia also worked on Dweller's, arranging most of its music.

Chang is known for her distinctive style of pixel art and animation with flexible lines and dynamic subjects, conveying a sense of nostalgia.

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