star wars - Is a droid a ‘he/she’ or an ‘it’?

Droids have personality, and that personality can be masculine or feminine.

R2-D2 and C-3P0 have (arguably) masculine personalities, either because they developed that way or they were initially programmed that way. Or, potentially, because I have a cultural bias that paints the actions of both as 'more male' than 'more female'.

Therefore it's not incorrect to apply gendered pronouns to them. 'It', however, would also be accurate.

Some droids, rarely referenced, are more appropriate to be called 'male' or 'female' due to...enhancements made to suit their primary purpose, but they are rarely touched upon even in the books.

There's more evidence that C-3P0 is male, quite famously.

As this NSFW photo attests to