At one time, Nurshary was intended to evolve from a bivalve Pokémon that resembles a first aid kit, which could also evolve into a surgeon sturgeon. However, Nurshary was the only one of the three to get enough support to be added to the Pokédex.
Nushary is based on a nurse shark, as well as the concept of an actual nurse. It is pink and slightly effeminate, akin to other Pokémon that have traditionally been depicted as nurses, and its dorsal fin is shaped like a nurse's cap. The large pink cross on its head is a reference to the International Red Cross symbol which denotes medical intent in much of the world.
Nurshary's name is a combination of nurse, nursery and shark.