Basically what the title says. There’s always discussions about someone being force sensitive and how they could use the force or not sensitive to it at all, but has anyone ever been completely immune to it? Like if Vader was doing a force choke and the person was just like “why are you holding your hand up like that? What are you trying to do?”
Everybody talks about Legends canon but in the main canon Toydarians are not force immune but force resistant. There's the line in ep 1 where Qui Gon is trying to convince Watto to take credits and Watto is all like "get the fuck outta here with that bullshit, it doesn't work on us".
Additionally, also only in Legends canon, there are also the Yuuzhan Vong, a species from outside the Galaxy that was entirely unconnected to the Force. They could not be sensed through the Force and were immune to most Force abilities that directly targeted them, though they could be affected by some abilities, i.e. telekinetically thrown objects or Force Lightning.
They are a major plot point in the Thrawn books. They act as Thrawn’s ace in the hole to try and defeat Luke, and they are a precaution for the insane Jeedi master he has recruited.
I don't know about individuals but some species were immune to at least parts of the force. Watto was immune to mind tricks in TPM and said his entire species was as well.
Nobody mentions how dense the atmospheric air pressure on Tatooine must have been for those tiny wings on him to be enough to give him flight. The speed of Luke's T-16 must have been fairly slow so it wouldn't have burst into flames from just friction with that dense air.
There was a multiplayer mode in Jedi Knight II, Capture the Ysalamiri. Like capture the flag, but when you captured it you couldn't use any of your Force abilities.
Fuck I loved those games.