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Betty's Friends and Classmates
- Voiced by: Laurie Elliot
- All Love Is Unrequited: Asides from the occasional Ship Tease, Betty is mostly unaware of his feelings for her.
- Brainy Brunette: He has brown hair and is also an Honour roll student who's very good at math and writing.
- Butt-Monkey: Though having very few enemies and a regular social standing at school, Noah has fallen victim to occasional misfortune throughout the show, which only increased as the series entered its final season.
- Childhood Friend Romance: He has secret feelings for Betty, but she shows more romantic interest in other boys, to his jealousy. However, he does get the occasional Ship Tease with Betty that implies she may not be totally oblivious to his feelings for her.
- Green-Eyed Monster: A little. He often shows strong signs of envy whenever Betty's hanging out more with other kids and much prefers it when the friendship is just between him and Betty. In Season 3, he often feels similarly about being left out of all the exciting parts of Betty's missions.
- Jumped at the Call: He was very enthusiastic about the opportunity to join the Galactic Guardians when DeGill offered the spot. However, he's not very happy at being nothing more than an auxiliary member of the team and occasional test subject for X-5's gadgets.
- Masculine Girl, Feminine Boy: His timid personality makes him the Feminine Boy to Betty's Masculine Girl.
- Muggle Best Friend: To Betty, although unlike most others, he isn't aware of Betty's double life (until Season 3 anyway).
- Naïve Newcomer: Fills this role in the Galactic Guardians in the third season when he joins the organization as a cadet (and occasional test subject).
- Nice Guy: For the most part, Noah is a pretty friendly kid.
- Non-Action Guy: Until Season 3 when he joins the Galactic Guardians.
- Secret Keeper: He finally learns of Betty's secret identity in the Season 2 finale, becoming this as a result, especially with his dad's constant attempts to prove the existence of aliens.
- Voiced by: Catherine Disher
- Alpha Bitch: About as straightforward as they come. She's a mean, snobby, spoiled, and rich girl who thinks of herself as superior to everyone else.
- Asian Airhead: Of the Alpha Bitch variety. While not immediately obvious at first glance, she is part Chinese, and it's also stated a few times that she doesn't do very well on her homework.
- Asian Rudeness: Penelope is a mean and rude popular girl who's partially Chinese-Canadian.
- But Not Too Foreign: She's part-Chinese from her mother's side.
- Butt-Monkey: Most of her attempts to insult or embarrass Betty often end up backfiring and causing her own humiliation, though sometimes she doesn't even have to have interacted with Betty at all that day for any karmic retribution to occur.
- The Friend Nobody Likes: Betty, Noah, and the others have no problem letting her hang out with them or inviting her to events such as Betty's birthday party despite her constantly mocking and belittling them whenever she can. The final episode makes it clear that this dynamic stays in place well into the group's teen years.
- Hidden Depths: It's hinted on a few occasions that she's not as shallow as she behaves, such as when she was seen mourning at her cat's grave.
- Hollywood Tone-Deaf: A few episode show her to be a horrible singer.
- It's All About Me: She loves possessing authority (and abusing it) and the attentions of everyone else. As far as she's concerned, the spotlight must always be on her.
- Jerkass: She's such a bitch that in one episode, a species of wasp-like aliens identified her as the most evil woman in the galaxy!
- Laser-Guided Karma: Some of the things that happen to Penelope would make one feel bad for her if it wasn't for the fact she's a colossal bitch who deserves what she gets 90% of the time and usually brings it upon herself.
- Pet the Dog: Although generally selfish and arrogant, she's not above the occasional act of kindness towards Betty and her friends.
- Rich Bitch: She comes from an upper-crust background, which is implied to be part of the reason for her snooty behaviour.
- Spoiled Brat: Her dad will give her anything she asks for no matter how outlandish.
- Tomboy and Girly Girl: Her interest in shopping and trendiness makes her the Girly Girl to the athletic and action-y Betty's Tomboy. The dynamic is also the source of a lot of the antagonisms between them, as Penelope sneers at Betty's interests in sports and space for how boyish they are.
- Vocal Evolution: Her voice gets snootier and whinier as the series goes on.
- Voiced by: Alexandra Lai
- Ambiguously Human: Her supernatural abilities, the strange eyes she gets when she shows them off, and her knowledge of the greater galaxy suggest she might not be just an ordinary 12-year-old girl. Indeed, she's in fact a half-alien, half-demon shapeshifter.
- Mysterious Waif: Her introduction into the show starts off quite ordinary but as Season 2 progresses, it's pretty clear that there's a lot more to her than she claims or that Betty even knows.
- Nice Girl: Brushing the enigmatic aspects of her character aside, Paloma is genuinely a pleasant and friendly girl who does her best to get along with everyone.
- Non-Human Humanoid Hybrid: Her true identity is the daughter of Queen Gologotha of Sharbena and the demon imprisoned in the Beluvian Demon Box, making her half-alien, half-demon.
- Not-So-Phony Psychic: She's even managed to predict the future, but claims that her predictions were merely coincidences. Given everything mysterious about her though, that is doubtful at best.
- Put on a Bus: Leaves the show at the start of Season 3, with the last we see of her is Maximus in pursuit of her as part of a gambit to keep him away from Earth.
- Secret Secret-Keeper: Implied. She often hints at awareness of things that only someone who's been around the universe as much as Betty could know of, sometimes even making offhand mentions of different planets and creatures Betty has encountered.
- Shapeshifter: Due to her mother's species being able to change appearance, she possesses this ability.
- Speaks Fluent Animal: As Noah learned when they visited the zoo, Paloma can communicate with animals. However, she insists that she merely has a way with animals.
- Technicolor Eyes: Her eyes turn into a deep shade of amber when she shows off her mysterious powers.
- Walking Spoiler: Let's just say that there's a lot more to Paloma than meets the eye.
- Witness Protection: The reason why she moved to Earth. After she helped the Galactic Guardians defeat her sister Pandora, she was placed on Earth in the guise of an ordinary girl so that Pandora would never find her and get her revenge.
- Voiced by: Leah Renee Cudmore
- Voiced by: Scott McCord
- Voiced by: Peter Oldring
- Abhorrent Admirer: Often becomes this for the other girls at Betty's school, notably Penelope and Paloma.
- The Bully: Natch. His favourite target is Noah, but he also antagonizes Betty, Paloma, and others pretty regularly.
- Jerkass: He's mean, he's bossy, he likes to play nasty pranks on others, and his first words towards anyone he meets are usually childish insults. Overall, not a pleasant kid.
Megan and Sarah
- Voiced by: Stephanie Morgenstern and Catherine Disher
- Fat and Skinny: Megan is the fat one and Sarah is the skinny one.
- Flat Character: Although they do get some major screentime in a few episodes, they mostly just serve as satellite toadies for Penelope, so we don't get to know much about them.
- Girl Posse: They're a pair of less fashionable and less popular girls who bootlick Penelope to stay at the top of the school food chain.
- Voiced by: Dwayne Hill
- Demoted to Extra: After Chaz was introduced in Season 3, Dylan was reduced to background roles as there was no longer a need for him to be Betty's love interest.
- Nice Guy: The only thing we really get to know about him is that he's a friendly and laidback kind of guy who doesn't find appeal in mean and shallow girls like Penelope.
Chip and Dalton Osborne
- Voiced by: Michael D'Ascenzo
- Flat Character: Due to the fact that they don't get much attention, but what we do see of them suggests they're a rowdy and fun-loving pair.
- Non-Identical Twins: Although stated to be twins, they don't look especially alike.
- Those Two Guys: They're always seen together. Being brothers, they're naturally inseparable.
The Barrett Family
Mr. and Mrs. Barrett
- Voiced by: Patrick McKenna and Kristina Nicoll
- Bumbling Dad: Mr. Barrett has shades of this. While he is a little bit absent-minded, he is genuinely a competent salesperson.
- Chatty Hairdresser: Mrs. Barrett is modelled after them, with her clothes, hairstyle, and personality being similar to what is traditionally associated with them.
- Feminine Mother, Tomboyish Daughter: Mrs. Barrett has this dynamic with Betty.
- Good Parents: Although oblivious to Betty's frequent absences, both of them care a lot about their daughter and enjoy spending time with her. That said, it does seem that Betty has a better relationship with her dad than her mom due to her dislike for her mom's cat and tendency to force her interests on her.
- Hartman Hips: Mrs. Barrett possesses a prominent set of them.
- It's All About Me: Mrs. Barrett has a tendency to this. While she does care for Betty, she is also rather self-centered and sometimes forces her dreams and interests on a very frustrated Betty.
- Kindhearted Cat Lover: Mrs. Barrett is a very nice lady who adores her pet cat Purrsy, often to Betty's annoyance.
- My Beloved Smother: Mrs. Barrett treats Purrsy in this manner, completely spoiling him with human luxuries. Purrsy generally doesn't seem to mind.
- No Celebrities Were Harmed: Mr. Barrett's voice is an impression of American actor Jimmy Stewart.
- Parental Obliviousness: They are totally unaware that Betty is a Galactic Guardian and rarely notice how often Betty vanishes for long periods of time.
- Traveling Salesman: Mr. Barrett is modelled after these kinds of people, with their stereotypical mannerisms, speech patterns, and clothing.
- Wacky Parent, Serious Child: They're both pretty goofy compared to their more mild-mannered, down-to-earth daughter
- Wanted a Gender-Conforming Child: Mrs. Barrett seems to have this relationship with Betty. She often tries to get Betty interested in things like fashion and shopping to no avail.
- Unnamed Parent: We never learn the first names of either of them. Fans usually call them Quincy and Tanya.
- Voiced by: Jayne Eastwood
- Action Girl: While she doesn't do as much fighting as her granddaughter due to being retired, she's still capable of kicking some serious butt.
- Cool Old Lady: Without a doubt. Betty absolutely adores her, even before she learned her grandmother was a former Galactic Guardian.
- Cordon Bleugh Chef: A Running Gag is her weird and disgusting cooking, such as cow tongue and prairie dog pie. Betty doesn't seem to mind it too much however.
- Doting Grandparent: She loves her granddaughter very dearly and thoroughly supports Betty in everything she does.
- Half-Human Hybrid: As revealed in "Auntie Matter", her father was a powerful alien being with black hole abilities. Her sister inherited her dad's traits.
- I Was Quite the Looker: Some flashbacks to her youth as a Galactic Guardian show her to have been quite beautiful, looking a bit like a grownup version of Betty.
- Never Mess with Granny: As a number of Atomic Betty's foes have learned the hard way, Beatrixo has still got the strength and skills of a young Galactic Guardian in her old age.
- Retcon: In her first appearance, she was the mother of Betty's dad, but in Season 2, she becomes Betty's maternal grandmother instead.
- Retired Badass: She spends her days on the farm now, but every once in a while, comes back to help her granddaughter defeat whatever alien supervillain is threatening the universe this week. She's eve got her old spaceship and Galactic Guardian equipment still around exactly for those sorts of occasions!
- Secret Keeper: She's the first person to show awareness of Betty's double life as a Galactic Guardian due to having been one herself.
- Secret Legacy: As Betty learns in the Season 1 finale (but was hinted at in her debut), she was also a Galactic Guardian when she was younger.
- Voiced by: Juan Chioran
- Butt-Monkey: A lot of terrible things happen to him throughout the show, usually as a result of the antagonism between him and Betty.
- Cats Are Mean: Much like Maximus I.Q., Purrsy is a feline who enjoys interfering in Betty's life and trying to ruin it. He even looks uncannily similar to Maximus.
- Cool Cat: Probably a trait inherited from his fashion-obsessed owner. Purrsy is shown to be quite suave and smug, especially after he gains the ability to speak.
- French Jerk: After he becomes an Uplifted Animal, he speaks with a French accent that fits his smug and spoiled personality.
- Hairball Humor: Takes great pride in his hairballs, treating them as high-class art.
- Only Known by Their Nickname: It's apparently short for "Sir Purrsefus".
- Punny Name: It's a play on "Percy".
- Uplifted Animal: In the episode "If the Shoe Fits", he gains the ability to speak, which sticks for the remainder of the series (although it only ever appears in the ending shorts).
- Voiced by: Cole Caplan
Principal Chet Peterson
- Voiced by: Dwayne Hill
- Voiced by: Dwayne Hill
- Conspiracy Theorist: Although, he is actually correct in his beliefs - it's just that he's too crazy for most people to take seriously.
- Gadgeteer Genius: He makes various gizmos that he uses to attempt to prove that there are aliens around Moose Jaw Heights. While they do work, he often makes the wrong conclusions from the results.
- Voiced by: Nissae Isen