Rinka and Kenichi are production assistants working for Alola TV under George Charino. As George was at a television set talking to Ash and his classmates, Rinka and Kenichi came up to him and informed him that the lead actors of the television show The Refreshing Trio: Alola Idols would not make it to the studio because their plane from Sinnoh had been caught in a blizzard. The two then panicked and asked George for advice on how to make sure the program would still air. George then decided to cast Lana, Lillie, and Mallow for one episode.
Rinka and Kenichi are named and designed after their Japanese voice actors, Rinka Ōtani and Hyadain (whose real name is Kenichi Maeyamada), who are two of the co-hosts of Meet Up at the Pokémon House?.[1]
Rinka's design is specifically modeled after her first-ever outfit on Pokénchi.
Closed captions for the English dub refer to them as female staff member and male staff member.
Artwork of Rinka and Kenichi from the announcement of their guest appearance