A Rescue-Bot that transforms into a fire engine and is partnered with Kade Burns (he is also the leader of the Rescue Bots). He dislikes the fact the Rescue Bots have to pretend they are mindless robots. He has a temper at times, but understands the need to place saving lives above all else.
Knight in Sour Armor: Thing is, Heatwave does believe in truth, justice and all that other stuff. He's also very devoted to the Rescue Bot cause. He just doesn't like not being recognized by anybody for his hard work and dedication, hence the sour.
A Rescue-Bot that transforms into a police car and is partnered with Chief Charlie Burns. Chase has a "by-the-book" personality and tends to fuss over any new concept that violates any law he is familiar with, though at times his sense of humor and understanding emerges. He gets along well with his human partner Chief Charlie Burns.
The Spock: Though a more compassionate version than some others, coupled with a strong sense of morality, if his immediate disregard of the rules to stop a potentially dangerous and/or lethal toxic waste spill in "The Alien Invasion of Griffin Rock" is any indication.
A Rescue-Bot that transforms into a bulldozer and is partnered with Graham Burns. Boulder is fascinated with Earth culture and is always eager to learn more from books and other sources. He has a very kind and friendly demeanor.
A Rescue-Bot that transforms into a rescue helicopter and is partnered with Dani Burns. Back on Cybertron, Blades had a land-based vehicle mode and is not used to flying, thus culminating in a slight fear of heights. Out of the Rescue Bots, he is the most expressive emotionally.
Acrophobic Bird: He never had the ability to fly until he landed on Earth. He was not happy about the change.
Badass Adorable: The cutest, softest, sweetest of all the Rescue Bots, still won't hesitate to put his spark on the line to save people.
Legendary Autobot Scout, war hero, and member of Optimus Prime's team of Autobots. As seen in Transformers Prime, Bumblebee lost his voice box in the line of duty and possesses a unique form of speech.
Cute Mute: Thanks to an injury to his voice box he sustained during the war, Bumblebee can only communicate through R2-D2-esque beeps and whirrs.
Intelligible Unintelligible: While most humans (including the viewers) can't understand Bumblebee's beeping language, no Transformer ever seems to have this problem.
Cody's older brother and Griffin Rock firefighter. He is somewhat of a glory-hog and isn't too keen on working with Heatwave at first, though they eventually come to respect each other (though neither would admit it).
Cody's older brother and Griffin Rock construction engineer. At first he has trouble working Boulder due in part to his own misconceptions. Though he is fascinated by Boulder and wishes to learn about Cybertron, he mistakenly believes that because Boulder is from an advanced alien civilization, there is little he (someone from a more primitive civilization like Earth's) could possibly teach him.
Cody's older sister and Griffin Rock rescue helicopter pilot. Unlike her partner Blades, Dani loves flying and has trouble getting along with Blades due to his fear of heights, but eventually learns how to work with him.
The youngest member of the Burns family. Despite his age, he acts as the team's communications officer. He also acts to help the bots become accustomed to life on Earth and guide them. He acts as a mediator between them and his older siblings. Occasionally, he helps out in the field (such as riding in Blades with Dani).
The Heart: While Cody is the team's Mission Control, the biggest reason he's part of the crew is because he alone can unify the Rescue Bots and their human teammates. Heatwave flat-out refuses to work without him in the first episode.
Wise Beyond Their Years: While less obvious than Frankie, he has several moments where he comes off as much more rational and levelheaded than most of his siblings, such as when he points out to Kade that starting out a conversation with his sister by being angry and demanding is not only going to end in a fight, but probably not going to get him what he wants.
"If you yell at her, she's just going to yell back."
Griffin Rock's inventor, scientist, and father of Francine Greene. Though many of his inventions he creates are meant to be helpful or with good intention, they have a tendency to go haywire or cause trouble in Griffin Rock, which the Rescue Bots and the Burns Family are forced to deal with. As a result, Doc Greene often finds himself being rescued from various mishaps caused by his inventions. His inventions include a solar-powered car, Floatium (a substitute for helium) and a high-powered communications dish.
Doc Greene's daughter and friend of Cody's. She is somewhat suspicious of the Rescue Bots. In "Countdown," it is revealed that Francine is afraid of the dark. In "The Haunting of Griffin Rock," it is revealed that Francine's middle name is Elma named after Griffin Rock's first scientist Elma Hendrickson.
The recurring antagonist of the series. Dr. Thaddeus Morocco is a mad scientist who invents things to cause damage. He is behind several of the incidents that occurred in Griffin Rock. He plotted revenge against Chief Charlie Burns, Mayor Luskey, and Doc Greene for making him an outcast.