Let's list them.

Artemis Entreri - Forgotten Realms
Bruenor Battlehammer - Forgotten Realms
Cyric, The sly Zhent thief - Forgotten Realms
Drasek Riven - One or t'other
Drizzt Do'Urden - Forgotten Realms
Elminster, The old Sage - Forgotten Realms
Erevis Cale - Forgotten Realms
Kelemvor Lyonsbane - Forgotten Realms
Khelben "The Blackstaff" Arunsun - Forgotten Realms
Magadon - beats me
Wulfgar - Forgotten Realms

Looks like they're all related to the Forgotten Realms series in one way or another.