In the film Arrietty , Ryunosuke Kamiki was the voice of Arrietty 's human friend who was older than 15 .
Arrietty was voiced by Saoirse Ronan in the United Kingdom dub and by Bridgit Mendler in the United States dub . *Ryunosuke Kamiki as : A 12-year old human boy who becomes Arrietty 's friend .
Arrietty