Trying to come up with a comprehensive list from movies, novels, TV, comics, video games, etc. Especially robots normally associated with being partners, teammates and sidekicks of humans. For example:
R2D2 and C-3PO, from Star Wars. (movies)
R. Daneel Olivaw (Isaac Asimov’s Robot novels)
animated Fantastic Four’s Herbie (TV)
Gyro Gearloose’s (Little) Helper (Disney’s Carl Barks comics)
This would tend to DISQUALIFY Buzz Lightyear’s arch-enemy, Emperor Zurg, the Terminator robots and Voltron, etc. Unless you know something I don’t know.
Robby The Robot is my all time fave robot.
The robot agent in the TV series Get Smart was Hymie
There was Johnny 5 from Short Circuit
Robin Williams played a robot called Andrew in Bicentennial Man
Princess Vespa from Spaceballs had a droid called Dot Matrix
There was also Robocop, but he was the main character in those movies, not the sidekick
[dumb anime fact] In Ah! My Goddess! Skuld has a sidekick she made named Banpei. (I’m referring to the comic here, though he also shows up in the Adventures of the Mini-Goddesses anime) [/dumb anime fact]
Does anybody else remember Quark? That had Andy the Android, though I had to do a Google search to remember that.
If you mention “Holmes and Yoyo,” you need to mention its source: Brillo by Harlan Ellison and Ben Bova
In Tanith Lee’s The Silver Metal Lover, the robot was a lot more than just a sidekick.
Zen, Orac, and Slave from Blake’s 7. Especially Orac, for his comment, “I am shutting down. I have much to do. You have engaged my circuits on your petty affairs for far too long.”
The Vision, in Marvel’s Avengers. Former husband of the Scarlet Witch.
L-Ron, from the 90s Giffen-era Justice League
Tomorrow Woman: one issue appearance in the new JLA.
The Brain, leader of the Brotherhood of Evil, Doom Patrol’s arch-enemies. Also Robotman from Doom Patrol.
Ilsa the Robot, from DC’s Tommy Tomorrow.
Marvel’s Machine Man
DC’s The Metal Men: Lead, Iron, Mercury, Platinum, Gold and Tin.
(Wait! They weren’t exactly sidekicks, were they? But they were teammates, and teamed-up with other heroes, and Platinum and Will Magus had this weird ‘love’ thing going, so…)