Question: Yūki Tokiwa (常盤 祐貴 , Tokiwa Yūki , born on August 16, 1991 in Hyōgo-ken) is a Japanese voice actor, he  is the official Japanese voice dub-over artist for actor: "Rupert Grint" as which fictional character in J. K. Rowling's "Harry Potter" series?
Context: Yūki Tokiwa (常盤 祐貴 , Tokiwa Yūki , born on August 16, 1991 in Hyōgo-ken) is a Japanese voice actor represented by Gekidan Himawari.  He is the official Japanese voice dub-over artist for actor: "Rupert Grint" as "Ron Weasley" in the Harry Potter film series and for Daryl Sabara. Harry Potter and the Philosopher's Stone (released in some countries as Harry Potter and the Sorcerer's Stone) is a 2001 British-American fantasy film directed by Chris Columbus and distributed by Warner Bros.  Pictures.  It is based on the novel of the same name by J. K. Rowling.  The film is the first instalment in the long-running "Harry Potter" film series, and was written by Steve Kloves and produced by David Heyman.  Its story follows Harry Potter's first year at Hogwarts School of Witchcraft and Wizardry as he discovers that he is a famous wizard and begins his education.  The film stars Daniel Radcliffe as Harry Potter, with Rupert Grint as Ron Weasley, and Emma Watson as Hermione Granger. Yūki Kaji (梶 裕貴 , Kaji Yūki , born September 3, 1985) is a Japanese voice actor and singer affiliated with the agency VIMS.  He has voiced many notable roles such as Eren Yeager in "Attack on Titan", Shu Ouma in "Guilty Crown", Alibaba in "", Issei Hyodo in "High School DxD", Meliodas in "The Seven Deadly Sins", Yukine in "Noragami", Speed-O'Sound Sonic in "One-Punch Man" and Kanato Sakamaki, in "Diabolik Lovers".  He was part of the four-unit singing group which was part of the "Goulart Knights" project, and has acted as one of the main protagonists in the movie "Kami Voice: The Voice Makes a Miracle".  He won the Best Rookie Actor Award in the 3rd Seiyu Awards in 2009 and marked the first voice actor in Japan to win the Best Voice Actor Award two years consecutively in the 7th Seiyu Awards and 8th Seiyu Awards in 2013 and 2014.  He has also been hosting the web radio show Yūki Kaji's Monologue (梶裕貴のひとりごと Kaji Yūki no Hitorigoto) since March 2014. Atsuko Yuya (湯屋 敦子 , Yuya Atsuko , born September 1, 1968) is a Japanese voice actress who works for Gekidan Subaru.  Atsuko Yuya is originally from Nagasaki.  She is the official Japanese voice dub-over artist for actresses "Angelina Jolie" and "Natasha Henstridge". Daisuke Hirakawa (平川 大輔 , Hirakawa Daisuke , born 4 June 1973) is a Japanese voice actor.  Born in Niigata Prefecture, he is sometimes mistaken for fellow voice actor Daisuke Namikawa, as their names only differ by one character when written in kanji.  He is the official Japanese voice actor for Orlando Bloom.  For some roles, he is also known as Tatsuya Hirai (平井 達矢 ) . Several actors of the United Kingdom and Ireland have voiced or portrayed characters appearing in the "Harry Potter" film series based on the book series by J. K. Rowling.  Daniel Radcliffe, Rupert Grint and Emma Watson have played Harry Potter, Ron Weasley and Hermione Granger in all the films.  When they were cast only Radcliffe had previously acted in a film.  Complementing them on screen are such actors as Helena Bonham Carter, Jim Broadbent, John Cleese, Robbie Coltrane, Warwick Davis, Ralph Fiennes, Michael Gambon, Brendan Gleeson, Richard Griffiths, Richard Harris, John Hurt, Jason Isaacs, Miriam Margolyes, Helen McCrory, Gary Oldman, Alan Rickman, Fiona Shaw, Maggie Smith, Timothy Spall, Imelda Staunton, David Thewlis, Emma Thompson, and Julie Walters, among others.  Thirteen actors have appeared as the same character in all eight films of the series. Ronald Bilius "Ron" Weasley is a fictional character in J. K. Rowling's "Harry Potter" series.  His first appearance was in the first book of the series, "Harry Potter and the Philosopher's Stone" as the best friend of Harry Potter and Hermione Granger.  He is a member of the Weasley family, a pure blood family, who reside in "The Burrow" outside Ottery St. Catchpole.  Along with Harry and Hermione, he is a member of the Gryffindor house.  Ron is present in most of the action throughout the series. Nachiket Dighe (Marathi: नचिकेत दिघे "Nacikēta Dighē") born 11 November 1987) is an Indian actor and dubbing voice actor, who dubs in Hindi, Marathi, and English.  He is best known for his Hindi voice-dubbing of Rupert Grint's role as Ron Weasley, in the Harry Potter film series.  He is the official Hindi voice dub-over artist for Kevin Jonas and Toby Amies.  Despite that Jonas and Amies are in different age groups, Dighe is able to perfectly match the quality of their voices when it comes to dubbing their roles in Hindi.  He is also married to Rucha Dighe. Hiroya Ishimaru (石丸 博也 , Ishimaru Hiroya ) is a Japanese voice actor most famous for performing the role of Koji Kabuto in the 1972 series "Mazinger Z" and its sequels.  He also voiced Tutty from "Bosco Adventure" and recently voiced Ultraman Taro in "Ultraman Story", "Ultraman Mebius", and "Ultraman Mebius and Ultra Brothers."  He is also the official Japanese dub-over voice artist for Jackie Chan.  He voiced Dracula in "".  He also voiced Lei Wulong from the "Tekken" fighting game series, who has a strong resemblance to Jackie Chan. Harry Potter and the Chamber of Secrets is a 2002 British-American fantasy film directed by Chris Columbus and distributed by Warner Bros.  Pictures.  It is based on the novel of the same name by J. K. Rowling.  The film is the second instalment in the long-running "Harry Potter" film series.  It was written by Steve Kloves and produced by David Heyman.  Its story follows Harry Potter's second year at Hogwarts School of Witchcraft and Wizardry as the Heir of Salazar Slytherin opens the Chamber of Secrets, unleashing a monster that petrifies the school's denizens.  The film stars Daniel Radcliffe as Harry Potter, with Rupert Grint as Ron Weasley, and Emma Watson as Hermione Granger.  The film is also the last film to feature Richard Harris as Professor Albus Dumbledore, due to his death that same year.
Answer: Ronald Bilius "Ron" Weasley