All of the new roles are functionally similar to the existing vanilla roles. The Avikan hunters, for example, are just combat roles. Hunter crewmembers are equipped with hunting weapons and as such any kills they make can drop hunting materials, but otherwise they are the same as other combat roles.

Engineers and mechanics work the same as vanilla ones, and the Rhaiod crewmembers are just healers. Thelean crewmembers are all combat roles, as are the rimdwellers and the Avikan rogues.

As for the uniforms, races with unique body shapes sadly have to have preset outfits. The tailor doesn't take race into consideration, so changing the uniform for Avikan while you play as a Human (for example) would make your Avikan crewmembers wear human clothing. Since the sprites are so different that would end up looking very odd and to prevent this, they have preset uniforms.