I truly admire of Harlan Ellison, the great man, great writer.
Composer? I'll be banal, but I love Christopher Franke... he made fantastic music...
Creator? Spielberg... he is contienues to surprise me...
Actor? Johnny Depp and Ralf Fience...
as for my own country writers I'll be recommend Oleg Divov he works in fantastic and writes really genious books...