Inspector Gadget, obviously: Dr. Claw has cameras everywhere.
Including, occasionally, Gadget's house.
Used occasionally in Batman: The Animated Series, which is often lampshaded by writer commentary. One episode in particular has the Joker show fellow villains a recording of a time he took over a late night television show - a video that includes camera shots backstage and all around the studio, in angles that shouldn't be possible. Another has Batman watch security videos of Mr. Freeze's origin, which for some reason includes close ups and camera cuts, as though someone not only used a film camera but edited it as well.
In Sonic Sat AM, Dr. Robotnik often made use of stealthy, floating camera robots to spy on Sonic and his friends...Popular Science recently had an article on similar technology currently in development by the US Military.
Parodied in The Simpsons Movie when the family are on the run. We see a huge room full of government bureaucrats listening in on inane conversations until one of them overhears Marge on one of the bugs they installed on a train. The bureaucrat joyfully leaps up and declares, "We found them! The U.S. Government actually found somebody we're looking for!"
The 1987 Teenage Mutant Ninja Turtles cartoon was particularly bad about this, as Shredder could pull up live surveillance feed from pretty much anywhere he damn well pleased. Sort of becomes a case of Fridge Logic when you consider that he was still never able to locate the turtles' lair.
Soundwave from Transformers Prime seems to be keeping tabs on everyone, in the premiere he's able to intercept communications between the Autobots and Agent Fowler without leaving the Nemesis. Aside from spying on enemies, he also keeps tabs on his fellow Decepticons in case any are plotting against Megatron. Made creepier by the fact that the only times he talks is in a distorted repeat of another character's dialogue.
The titular character and main villain in Belphegor is seen having cameras installed all over Paris. Belphegor uses them for spying purposes, which helps him a lot in his plans and is often the reason he's one step ahead of the protagonists.
YMMV, but Vee of Chuggington seems to come across as this, both functioning as a depot announcer and justifiably somewhat of a mother figure (for all purposes and intents), but the fact that she joins in the conversation makes her appear to be a disturbingly stalkerish personality, a faceless, overarching Big Sister, if you will.
Benson of Regular Show attempts this in the episode "Peeps", when he sees that Mordecai and Rigby start slacking off whenever he's not around; It goes too far when he calls for the maximum version of his surveillance system: A living, floating eyeball named Peeps that stalks everyone. Fortunately, Rigby knew how to cheat on staring contests at the time.
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