Is there a list published anywhere, or that someone has compiled that has all the Big Mega-Plot NPCs Matrix Handles listed anywhere matched up by who uses them?

Something like:

Orange Queen - Hesteby

Hmm. Course this example would work better if I knew more than one off the top of my head....

*fires-up the Aincient History signal*

Check the Immortals: Great Elves and Great Dragons section.