I'd bring up Mammets, who seem to possess at least a rudimentary amount of intelligence (Gigi of the Goldsmiths' Guild especially, who might even have feelings depending on how you interpret their actions), but even then they are flawed, and markedly unrealistic in terms of appearance and operation.
On a tangential note, however, I would be one to argue that if you're absolutely sure that being a robot is required in order for the character to be interesting, then you might be going about their development and implementation wrong. I'd look at what you're looking to explore in that character, and then see if there are alternative ways of exploring that path that are more cohesive with the game's environment. If you were to supply information along those lines, I'm sure that people here could even help you with it!
EDIT: Additional information regarding Gigi (spoilered because...Spoilers):
On a tangential note, however, I would be one to argue that if you're absolutely sure that being a robot is required in order for the character to be interesting, then you might be going about their development and implementation wrong. I'd look at what you're looking to explore in that character, and then see if there are alternative ways of exploring that path that are more cohesive with the game's environment. If you were to supply information along those lines, I'm sure that people here could even help you with it!
EDIT: Additional information regarding Gigi (spoilered because...Spoilers):
