who were the other actors from the first movie?
Daniel Radcliffe, Emma Watson
Rupert Grint
 On 8 August 2000, Daniel Radcliffe, Emma Watson, and an 11-year-old Grint were selected to play the roles of Harry, Hermione Granger, and Ron, respectively. 
who is rupert grint? He is an English actor. He rose to prominence for his portrayal of Ron Weasley, one of the three main characters in the "Harry Potter" film series. has he acted in any other movie? Yes,  "Driving Lessons", "Thunderpants", "Into the White"
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Rupert Grint [SEP] "Harry Potter" (2001–11)
Rupert, along with the film, was critically acclaimed: Ann Hornaday of "The Washington Post" asked, "Who could have predicted that Radcliffe, Grint and Watson would turn out to be good actors?". The film broke several box office records, including biggest midnight release, biggest first-day opening, and biggest opening-weekend. "Deathly Hallows – Part 2" got up to the 4th highest-grossing film of all time. "Harry Potter" author J. K. Rowling gave a speech during the world premiere of "Harry Potter and the Deathly Hallows – Part 2" on 7 July 2011 in London, England. She announced that there are seven "Harry Potter" film series cast members, to whom she refers as "The Big Seven," and she named Grint as one of the seven members, alongside Daniel Radcliffe, Emma Watson, Tom Felton, Matthew Lewis, Evanna Lynch and Bonnie Wright.