Meanie Bot and Scoota-Bot show us how it's done.
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Many robot versions of other ponies have been created since, particularily the other two CMC members.
While the so called "Sweetie Bot" is oblivious of her own robot-ness and visually appears to be a normal pony, most fandom robots will be aware of their mechanical situation, and have the appearance of a robot. They will, however, share a mechanical voice and similar name (I.E. AppleBloomBot)
Robots will usually appear in Tumblrpon permantly as the mane characters of their own blogs, but sometimes a normal character will have a quick appearance as a robot.
While gratituous robot fights and mechanical gags are common, the Robot trope is often used as a way to examine existentialism and acceptance.