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Heroes
Connor
Voiced by: Andrew Rannells (EN)
A kid who loves everything about robots.- Adorably Precocious Child: He's a darned good engineer, for a kid.
- Character Narrator: Only for the first seven episodes of the first season.
- Missing Mom: It's just him and his dad.
- Nice Guy: A quintessentially nice, compassionate kid.
- Wide-Eyed Idealist: Cares very much about about the welfare of robots.
Abby
Voiced by: Veronica Taylor (EN)
- Bare Midriffs Are Feminine: Despite being One of the Boys, she is still girlier than them or Hela (having Girlish Pigtails instead of Hela's Boyish Short Hair, preferring pink and purple clothes), and her purple tube-top is just above her navel.
- Fiery Redhead
- The Lancer: A rare example in which the token girl of the group is also this to the main character.
- One of the Boys
- Wrench Wench: Spends all her time hanging out in a garage doing robotics stuff.
Chip
Voiced by: Amy Birnbaum (EN)
- Big Guy, Little Guy: The Little guy to Mong's big guy.
- The Smart Guy: The brainiest of the four main kids.
- Shout-Out: His design looks a bit like Max. It helps that they have the same voice actress. Amy Birnbaum even uses the same voice.
- Shorter Means Smarter: He's little and smart.
Mong
Voiced by: Jimmy Zoppi (EN)
- Big Fun: He's pretty chubby, but always upbeat.
- Big Eater: Happily ate half a dozen donuts (while on a diet, no less).
Hela Nemo
Voiced by: Rachael Lillis (EN)
The friendly roboticist who runs the Botties Pit.- Disappeared Dad: Until the end of the first season.
- Parental Substitute: Basically a substitute mom for Connor.
- Robot Master: A professional roboticist.
- Ship Tease: With Graham, mostly in "Hurricane Havoc".
Cubix
Voiced by: Scottie Ray (EN)
- Do-Anything Robot: His ability to dissameble and reassemble allows him to take on multiple forms, from a hover-scooter, to a Drill Tank, and even a cannon assembly.
- Disney Death: At the end of the first series.
- Gentle Giant: Wouldn't dream of hurting an innocent.
- Heroic Sacrifice: At the end of the first season, though he comes back.
- Mecha Expansion Pack: In Season 2.
- The Power of Friendship: What brings him back.
- The Quiet One: For most of season one, he would only repeat the words of others on occasion. After his return, he gains the ability to speak full sentences in his own words.
Villains
Dr. K
Voiced by: Kim Ki-Hyun (Korean) Maddie Blaustein (English)
A former RobixCorp scientist who wants to Take Over the World.- Artificial Limbs: He has a mechanical lower right arm, which can transform into multiple devices (such as a Solex extractor).
- Bald of Evil: He is evil and he is bald.
- Big Bad: The main antagonist of the show.
- Enemy Mine: Pulls one with the Botties in the final episode.
- Even Evil Has Loved Ones: He is an evil mad scientist who he is distraught when the first robot and closest thing he had to a teddy bear back when he was younger is destroyed.
- Heel–Face Turn: It's implied that he had one in the final episode.
- Mad Scientist: A megalomaniacal roboticist.
- Robot Master: A megalomaniacal roboticist.
- Used to Be a Sweet Kid: "Klank" reveals that as a boy, Dr. K was a nice, kindly child.
Kilobot
Voiced by: Dan Green (EN)
Dr. K's ultimate creation, a robot who can absorb the powers of up to a thousand other robots.- 0% Approval Rating: In the Final Battle pretty much everyone participated in his death because he was that hated and posed a very significant threat to both robot and human alike. Even Dr. K and Kolossal are all in on this.
- Asshole Victim: By the time he dies NO ONE will be shedding tears or feel ANY sympathy for him, not even Dr. K and Kolossal.
- Assimilation Backfire: He copies Maximix' powers in "Tomorrow's Robots Today". Unfortunately for him, this included a program that ensured Maximix followed Mong's every command, allowing him to stop Kilobot just by telling him to. And ultimately, the copied programming allows the Botties to revive Maximix after Kilobot kills him.
- Bat Out of Hell: Designed after a vampire complete with the hellish black and reds.
- Collector of Forms: Can absorb data from other robots, allowing him to mimic their appearances, voices, and powers.
- Creepy Monotone: He speaks in a low, menacing type of voice.
- The Dragon: To Dr. K for season 2 and shares this role with Kolossal. While more competent than Kolossal, this doesn't last long come the finale.
- Dragon-in-Chief: Is the true villain of season 2 despite serving under Dr. K with Kolossal, he has proven to be more dangerous, deadly, and more smarter than either of them.
- Knight of Cerebus: While Dr. K's other creations are no laughing matter, Kilobot really stands out against the bright and colorful aesthetics of the show.
- One-Man Army: What he becomes after absorbing multiple robots. The more robots he absorbs, the stronger he becomes. He can call upon any of their powers and forms, and even mix and match them for added power. By the time he faces Cubix in "Tomorrow's Robots Today", he has absorbed the powers of fifty robots, allowing him to quickly overpower his foe.
- The Starscream: Near the end of season 2, he works behind Dr. K's back to enact his own agenda.
Kolossal
Dr. K's right-hand robot. This Frankenstein-like bot acts as the primary muscle of his team.- The Brute: Kolossal is one tough bot.
- The Dragon: To Dr. K, especially throughout all of season 1 and few parts of season 2 where he shares this role with Kilobot.
- Undying Loyalty: To Dr. K, even when Kilobot overthrows him.
- Xtreme Kool Letterz: His name begins with a 'k' instead of a 'c'.
Kulminator
Dr. K's second most powerful robot behind Kilobot. Initially Dr. K's base, his goal throughout the first season was to gather enough Solex to transform his hideout into the largest robot in the world.- Chest Blaster: Has one that can fire a Disintegrator Ray of pure Solex.
- Humongous Mecha: The biggest robot seen in the show.
- The Juggernaut: Almost nothing the Botties tried could stop it. It ultimately took a Heroic Sacrifice from Cubix in order to stop it from destroying Bubble Town.
- Transforming Mecha: Initially was an abandoned ice cream icon that served as Dr. K's base of operations before he converted it into a humongous robot by collecting enough Solex.
K's robot's
The team of combat robots making up Dr. K's army. They are: the mobile artillery unit Kannon, the one-wheeled terror Katastrophe, the birdlike Klawber, and the crustaceous Krab.- Detachment Combat: Katastrophe's wheel can sprout spikes and detach to run over enemies.
- Xtreme Kool Letterz: Just like Kolossal, each of them has a name beginning with a 'k' to match Dr. K's theme.
- What Happened to the Mouse?: After the season 1 finale, these bots just vanish altogether. Not even a cameo in season 2. Likely what happened is that after Kulminator was stopped, they were ordered to be scrapped by the town.
Others
Graham
Voiced by: Dan Green (EN)
Connor's dad, who initially dislikes robots, and the only member of the main cast who is not a roboticist.- Dad the Veteran: He's implied to have once been a soldier, judging by the picture of him with Connor and his wife with him being dressed in military uniform.
- Fantastic Racism: He dislikes all robots, until he warms up to Cubix.
- Good Ol' Boy: Essentially a futuristic twist on this trope.
- Jerk with a Heart of Gold: Didn't approve of Connor spending all his time on robot-related activities at first, but eventually comes to accept it.
- Out of Focus: He has far fewer appearances in the second season.
- Parents as People: He can be very stubborn, but he's a caring and compassionate father.
- Ship Tease: He has some with Hela, mostly in "Hurricane Havoc".
Raska
RobixCorp's official spokewoman.- Bitch in Sheep's Clothing: She acts nice and friendly to others, but behind closed doors, she has a demanding personality, and a rotten temper. And that isn't even the half of it...
- Dark Secret: She's Doctor K's alien partner in disguise.
- Suicidal Overconfidence: After Cubix manages to take out Kulminator's shields, she refused to retreat, intent on carrying out the rampage while Dr. K wisely escaped. This ended proving to be fatal when Cubix destroyed Kulminator, taking her with it.