I recently went into a strange mood and created a custom Notepad++ language that highlights every function for Danmakufu, and includes some nice highlighting of numbers, strings, and comments.
Screenshot:
Danmakufu initializations with # and comments are in green.
Basic functions are in purple.
Graphic and Sound related functions are in sea-green.
Basic loop and ifs, whiles, lets, are in blue, as well as math operations.
Get information functions and math functions like sin() are in maroon
Numbers are in orange and strings are highlighted, and you can escape strings using /.
Folders were implemented (and remain in the language) but I removed them because they disabled NPP's default bracket pointing.
And now for the download. Just open View -> User Defined Dialogue and Import the .xml.
http://www.mediafire.com/?86ywgd9zvuwarb3