While it had originally been intended that Frasier be an only child, Pierce was hired because Frasier producers saw his headshot and commented on how much he looked like a young Kelsey Grammer. Unlike Frasier, part of whose background comes from Cheers, Niles' background is established over the course of Frasier.
Pierce described Niles as "what Frasier would be if he had never gone to Boston and never been exposed to the people at Cheers."
Appearances in Christmas specials
- "Miracle on Third or Fourth Street"
- "Frasier Grinch"
- "Perspectives on Christmas"
- "Merry Christmas, Mrs. Moskowitz"
- "The Fight Before Christmas"
- "Mary Christmas"
- "We Two Kings"
- "High Holidays"