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Hashirama's chakra is noted to be quite difficult to control, as genjutsu tries to take control of someone's mind through their senses and chakra.
A lot of ninjas have resistance to genjutsu via training. Deidara trained his left eye to resist genjutsu. Special eyes like rinnegan, byakugan and sharingan have resistance to genjutsu, but not immunity. They actively cancel the genjutsu when caught. However, it's only sharingan that has done it directly.
The thing about genjutsu is anyone can fall for it when caught off guard. Resistance to genjutsu always fall under nullification.
I don't think there's any human (including Hashirama) who is straight-up immune to genjutsu.
As for Otsutsuki, their immunity to Omnipotence may give them a possible immunity to genjutsu.