Just wanted to add a few more arguments on locals.
A librarian is more than just an employee, they have a traits and personalities of their own, they add to the library identity and ambient.
A focused researcher may know exactly what book they want and pay no mind on how to get it but a young curious scholar may not be sure what he needs, experienced librarians are good in recommendations and pointers.
The We will be an efficient worker and get the book you want in no time... but is that really necessary for a library? Other options (except Dragon) may commit mistakes about book availability but its IMO a price to pay for variety. Why variety? Even if The We librarian can communicate well (which only writing makes difficult) it will still have only a singular mind and opinion, and I dont like it when I can have humans, halflings and dwarves staff voice theirs.
Im entire aware the We will have their own perks and also enrich the library identity, I just ask people see past efficiency and cool.
What you want the Library face and voice be like?