Senbei: That is because you are a robot, you don't change.
Arale: I wanna wanna wanna grow big!A robot built to look and/or act like a child. A good number of these are boys, but there are many that are girls. Possibly made as part of a Robo Family, or to be taken care of as a child of a human family (possibly as a Replacement Goldfish for a lost child of the creator or if the creator can't have biological children). When the kid's mechanic serves as a mentor and emotional caretaker, she's a Motherly Scientist (Fatherly Scientist if he's a man). May fall into Really 700 Years Old or Older Than They Look unless the robot was very recently built. If they were built very recently, they might actually be Younger Than They Look instead. In either case, it's common for the robot to feel that Not Growing Up Sucks.
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Anime & Manga
- Astro Boy. He's one of the Replacement Goldfish examples, but he also has combat abilities.
- Arale from Dr. Slump.
- Pino in Ergo Proxy.
- The main character of the short anime movie Hotori - Tada Saiwai o Koinegau is a little robot boy.
- Frankenrobo from Anpanman. Baikinman made him as a weapon against Anpanman, but he never became evil like Baikinman wanted, and Baikinman now tries to avoid him in any way he can, thanks to the fact that Frankenrobo now thinks of Baikinman as his dad, which leads him to hugging him, thus harming him thanks to Frankenrobo's electric touch. Baikinman later would attempt to create three other robots that started out evil...but thanks to Frankenrobo touching them and restarting them with his electricity when they were being repaired, they became as childish and friendly as their "big brother".
- A Creepy Child variant shows up in The Dark Knight Returns, where the Joker's bombs are sentient robot brats.
- Similar situation with Elsie Dee, created by Donald Pierce of the Hellfire Club to take out Wolverine. However, an assistant of Pierce's made her far more intelligent and sentient than Pierce intended, and she managed to get control of her systems and not blow up.
- Crybaby from Fall Out Toy Works is a boy robot in a bear suit pulled straight out of the cover art for Fall Out Boy's Folie a Deux. They also don't call him "Crybaby" for nothing.
- The Beano had one, back in the late 30s - early 40s, named Tin Can Tommy, who in later strips gained a robot brother.
- Rusty of The Big Guy and Rusty the Boy Robot.
Live Action TV
- A villainous example occurs in Taiyou Sentai Sun Vulcan, where Black Magma builds a robot version of a man's dead daughter. The robot eventually disobeys the villains because they'd programmed it to view the man as its father. Later, they do it again, this time replacing a living boy with a robot duplicate.
- Another villainous example happens in Choudenshi Bioman, where there's a robot copy of a boy from the Bio Star who was a friend of Peebo, made to lure the team into a trap.
- Extant: Ethan, who is raised to be John and Molly's son.
- Roll from Mega Man and Rock/Mega Man himself (who was originally a replacement made for an Astro Boy game that never happened). There's also Protoman/Blues, who combines it with Aloof Big Brother.
- MOMO from Xenosaga, though she's more of an Artificial Human than a robot.
- Quote (The Hero), among others in Cave Story.
- Balloon Boy in Five Nights at Freddy's 2.
- Tinny Tim on Futurama
- Also Bender's son in the DVD movie Beast With a Billion Backs.
- Jimmy Neutron has Brobot, created to be a younger brother rather than a son to his creator.
- Jenny of My Life as a Teenage Robot, though as the name would imply she's a teenager rather than a young child. She also has "siblings"—earlier prototypes made by her "mother"—that are based on younger kids, however.
- There is also the fact that while Jenny is designed to look like a teenager, she is chronologically 5 years old — a fact that forced her to transfer to kindergarten in one episode.
- Pinocchio is something of a fantasy variation in that he's a wooden puppet, not a robot, and was enchanted to be sentient rather than having AI.
- The title character of the cartoon Robot Boy
- There's also Robotgirl and Protoboy.
- Wheelie, the young autobot they find fending for himself with a slingshot on Quintessa in Transformers: The Movie. In subsequent episodes of the cartoon he would be paired with Daniel to make a Cute Kid And Robot pair.
- Robot Jones of Whatever Happened to... Robot Jones?.
- Big Guy and Rusty the Boy Robot. Rusty was not built as a family robot, though, unless all family robots fire energy beams from their hands and can fly around. Rusty, originally meant to replace the outdated Big Guy (who is actually a Humongous Mecha with a pilot inside, despite what the public believes). However, Rusty's childish demeanor and inexperience relegate him to the post of a sidekick, while the Big Guy still takes care of the big problems.
- Bobert in The Amazing World of Gumball, who attends Elmore Junior High along with all the human-like objects and animals. Why he does this and who made him is not explained or questioned.