Some of the characters on this list, like Gregory Powell and Michael Donovan, are recurring, appearing in more than one short story in the collection. But others are confined to a single section of the novel. There are multiple antagonists throughout the entire collection, some of whom are humans, and others are robots. But, all the stories are united in the same frame narrative in which Susan Calvin is relaying robot-related stories from her career to an unnamed interviewer.

 

Susan Calvin 

A character who first appears in the frame story sets up the stories that follow. She has worked for decades at the US Robots and Mechanical Men company and is telling each of the stories that follow. These are all based on experiences she heard or lived. 

The Interviewer 

The Interviewer goes unnamed throughout the entire book. This is the person who, in the future, is interviewing Susan Calvin about her experiences. He’s someone who has spent a lot of time with robots. 

Peter Bogert 

Peter Bogert is a mathematician who works for US Robots. He’s an unlikeable character who is very ambitious. He strives to improve his lot in life, often by less-than-ideal means. He later becomes the Director of Research. 

Gregory Powell 

Gregory Powell is one of the main reoccurring characters in ‘I, Robot.’ He appears alongside Michael Donovan in multiple stories, including “Reason” and “Catch that Rabbit.” 

Michael Donovan 

As with Powell, Donovan first appears in “Runaround,” the second story in the collection. The pair struggle to solve issues that their robots seem incapable of fixing themselves. Speedy, their main robot, is not working but through clever manipulation of the First Law, they fix him. 

Michael Donovan also features in “Reason” and “Catch that Rabbit.” The latter follows Donovan and Powell as they investigate a mining robot named Dave. Dave struggles to deal with emergencies by himself and melts down. But the two are able to fix him in a unique way. 

Robbie 

A robot in the story of the same name. He is a nursemaid whose job is to take care of a child named Gloria Weston. He is loved by her but unappreciated by her parents. He’s eventually sent to work in a factory, where he later rescues Gloria when they come to visit. 

Gloria Weston 

A character in “Robbie.” She is a child who has a robot named Robbie, who works as her nursemaid. Her mom doesn’t appreciate Robbie, based on local prejudice, and the family decides to get rid of Robbie. Gloria later sees Robbie working at a robot factory and almost loses her life as she tries to get to him. 

Speedy

A robot belonging to Gregory Powell and Michael Donovan is not working properly in the story “Runaround.” 

Cutie 

Another robot appears alongside Gregory Powell and Michael Donovan. They are investigating Cutie to see if the robot has the potential to run a space station. Cutie has one central issue, though—he doesn’t believe in Earth. He’s never seen Earth, so he’s incapable of believing it exists. 

Dave 

A robot that features in the story “Catch that Rabbit.” He’s a mining robot who struggles to deal with emergencies when people aren’t present. He eventually improves when Powell and Donovan shoot another robot, and Dave is able to save them. 

Herbie 

A robot who features in “Liar!” He has the ability to read minds and often tells people what they want to hear, avoiding the negative thoughts others have. He features alongside Susan Calvin in the story as well as Peter Bogart. Herbie goes insane at the end of the story, unable to reconcile the need, to tell the truth with the First Law (robots can’t hurt humans). 

Lawrence Robertson 

Lawrence Robertson is the founder of a company that may have invented the positronic brain (the brain type that’s used by all advanced robots). He is the president of an unnamed company and is not very important in any of the stories.

Dr. Alfred Planning 

He is the Director of Research at US Robots and Mechanical Men. He plays the role of manager or boss in any of his stories.

Stephen Byerley 

Stephen Byerley runs for mayor of an unnamed city and may or may not be a robot. He is intelligent, good, moral, and more likable than some of the other characters in Asimov’s collection. He eventually became World Co-Ordinator. 

Francis Quinn 

Francis Quinn is a character who sets himself against Stephen Byerley and who doesn’t believe in Byerley’s good intentions. He plays dirty and tries to keep Byerley from being elected. 

The Machines 

Inhuman robots that appear late in the short story collection. They are devoid of personality. 

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