In a 2015 interview with the Swedish magazine "Kidz World," Kaulitz mentioned "The Nightmare Before Christmas" as one of his favorite films, describing it as "really dark and a little bit scary, but also really funny and heartwarming."
He also praised the film's unique visual style and music, saying, "The animation is amazing, and the songs are really catchy. I love the whole atmosphere of the movie."
In another interview, Kaulitz revealed that he and his twin brother, Tom Kaulitz, the guitarist of Tokio Hotel, grew up watching "The Nightmare Before Christmas" and other Tim Burton films, and that they both "share a love for dark, twisted fairy tales."
Given these statements, it is clear that Bill Kaulitz has a positive opinion of the movie "The Nightmare Before Christmas."