- "You know, those who drink this never return."
- ―Mystake to Sensei Wu about Traveler's Tea
Mystake appears as an elderly woman with gray hair in a bun that she wears under a conical hat. She wears a light brown zip-up sweater with a zig-zag pattern across the front and a white shirt underneath. Her legs/pants are gray; the physical minifigure version from 70657 Ninjago City Docks comes with brown pants. Apart from being depicted with glasses, these are the only difference between the set and TV versions.
She has also appeared in the form of a rat. In her Oni form she resembles Lord Garmadon's original minifigure, but with legs that are more goat-like in shape. The bone-like markings on her chest are also smaller and located higher than Garmadon's. She has purple eyes like the other Oni, but her face has unique markings including lips between her jutting fangs. Mystake also has forward-jutting horns atop her head like several of the other Oni, a piece that has not been produced physically.
In Season One, she is accompanied by an unknown child, wearing sand green clothing.
She calls Lord Garmadon a fool in "Day of the Great Devourer", not turning to look at him. Lord Garmadon narrows his eyes, and Mystake takes it back and walks away to get him Traveler's Tea.
Sensei Wu gave Mystake money in order to get Traveler's Tea. She first said she had never heard of it but when Sensei Wu put the coins down, she retrieved it.
Wu and Nya visit her in "Child's Play" for Tomorrow's Tea for the Ninja, when they were regressed by Garmadon. It was that same tea that not only reverted the effects, but made Lloyd their age as well.
In "Lost in Time" Wu later advised his younger self to seek her out and obtain "Obscuri-Tea."
In "Big Trouble, Little Ninjago" she gives Lloyd a tea to help his injuries, but loses his powers as a result.
In "Two Lies, One Truth" she confesses to Lloyd that she is an Oni, but decided to help his grandfather, the First Spinjitzu Master, protect Ninjago.
- Her name was not revealed until the second season.
- She was rude to Wu, but for some reason, isn't to Garmadon, or his son, Lloyd.
- Ninjago: Masters of Spinjitzu
- Season 1
- Season 2
- Season 4
- "Spellbound" (flashback)
- Season 7
- "Lost in Time" (mentioned only)
- Season 8
- Season 9
- 70657 Ninjago City Docks