Gender Neutrality; There are gender neutral populations in the galaxy, and language exists to accommodate them and all genders inclusively.
Pronouns; xie/xir, they/them
Informal Titles; Mixter (shortened Mx/Mux)
Formal Titles; Dominex/Dom, Liege, Your Honor, Your Grace, etc
Feudal Titles; The Empire proliferates Feudal Titles such as Duchess, Baron and so on. In general a Peer with a Title goes by at least lord/lady/dom in conversation, lest you want to communicate serious disrespect.
Space Cusses; I don't think we have any yet.
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