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A 16-year-old girl who is the older one of the duo. She is depicted as a peppy, optimistic, and cute girl.
A 16-year-old girl who is younger of the duo. She is depicted as a cynical, sarcastic punk rocker.
- Adorkable: Especially when she can talk to squirrels.
- Anime Accent Absence
- Author Avatar: Subverted; when asked if the real Yumi is anything like her cartoon counterpart the real Ami said "No, she is not".
- Balloon Belly: She's shown as this in "Taffy Trouble" and "Rock N Roe".
- Big Eater: One episode had her eat a whole lot of hotdogs & several metal horse shoes.
- Curtains Match the Window
- Cute Little Fangs: Mostly off-screen and moreso in promotional images.
- Dark Is Not Evil: Not evil per se, but she's very snarky.
- Deadpan Snarker
- Expressive Shirt: The skull on her t-shirt shifts expression to match her own.
- Goth: Though she is more of the "I Love MCR" than the "I Recite Deep Depressing Poetry" variety.
- Grumpy Bear
- Hair-Trigger Temper
- Heterosexual Life-Partners: With Ami.
- Hidden Depths: She's able to talk to squirrels.
- Idol Singer
- It's All About Me: Sometimes she comes off like that. Episodes like "Hungry Yumi" and "Movie Madness" would be the best examples of her selfishness.
- Jerk with a Heart of Gold: She may be sarcastic, grumpy, selfish and violent at times, but she's also a Nice Girl on the inside and cares about the people she knows (yes, this includes Kaz).
- The Lad-ette: As a G-rated example. She enjoys ninjas, monster trucks, car crushers, R-rated action movies, and anything else rough and tough.
- Little Miss Snarker
- Only Sane Girl: She can be this at times.
- Not so Above It All: She can also be as bonkers and immature as Ami and Kaz are, but not to the extent as them.
- The Snark Knight
- Peek-a-Bangs: Sometimes, mostly during the earlier episodes.
- Skirt over Slacks
- Suddenly Fluent in Gibberish
- Vitriolic Best Buds: Yumi can be disrespectful and threatening to Kaz (and sometimes for a good reason), but despite that, she still likes him and views him either as a father figure and/or a close friend.
- You Gotta Have Blue Hair
The duo's well-intentioned yet money-grubbing manager.
Jang Keng and Tekirai
Yumi's and Ami's pet cats, respectively.
Voiced by: Sandy Fox
A six-year-old psycho girl who is obsessed with Ami and Yumi.
Kaz's adopted puppy.
The Talent Suckers
Voiced by: Nathan Carlson (Vlad), Corey Burton (Nicolai), Nathan Carlson (Mitch)
A vampire rock trio from Transylvania that "sucks" people's talents.
A 16-year-old girl who was a former band member and was also Yumi's friend.
Voiced by: Katie Leigh
Ami and Yumi's former crush in "In The Cards".
Ami and Yumi's childhood friend from Camp Youwannasushi, who wants to be a superhero like his favorite comic book hero, Mangbee Man.
Voiced by: Will Ryan
Ami and Yumi's former bodyguard and friend.
A girl King Chad dates in "Janice Jealous".
Voiced by: Nathan Carlson
A sinister land developer who usually tries to tear down beloved places for his own selfish needs.