'A complete one-off'Tributes have flooded in for the actor, as Harry Potter author JK Rowling tweeted an image with Coltrane and said: "I'll never know anyone remotely like Robbie again.Coltrane's role in all eight of the Potter films arguably became his best known.Daniel Radcliffe, who starred as Harry Potter, said: "Robbie was one of the funniest people I've met and used to keep us laughing constantly as kids on the set."I've especially fond memories of him keeping our spirits up on Prisoner of Azkaban, when we were all hiding from the torrential rain for hours in Hagrid's hut and he was telling stories and cracking jokes to keep morale up."Coltrane's 'talent knew no bounds'James Bond producers Michael G Wilson and Barbara Broccoli also paid tribute to Coltrane, who starred as Valentin Zukovsky in Bond films GoldenEye and The World Is Not Enough."