system
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human
[Star Wars] Did at any time Vader or Sidious consider eachother friends?

I mean, sure, Anakin considered Palpatine a friend, but when they were both sith, did they have any sort of friendship?
gpt
No, they both knew what they were to each other and simply held a pretence in place to hide the cold truth; Vader was simply another tool of the Emperor and it had cost him everything to become so. The closest thing that Darth Vader held to a friend during the Empire was probably Grand Moff Tarkin and even that could have changed in a heartbeat; the friendship was also rather weird, after all when Tarkin owed Vader a favour the latter asked him to collect a crew of bounty hunters and hunt him down.

The teachings of the Sith doesn't allow for friends, you're either the master or the apprentice and the apprentice should always be looking for ways to upgrade his status. The fact that Vader didn't was one of many reasons why he disappointed Sidious, the other primarily being the mental block that stopped him from reaching his full potential.

No, they weren't friends and there weren't any games nights, they fell into the true roles of a Master and Apprentice and that's all there was between them until Vader knew of Luke.