Not familiar with the last one, except the name and which video game he is associated with. But for the other three of this painfully narrow list... Your summation limited to how tough they are and what weapon they used.
So big sword, twin swords, and life-stealing sword?
How about Cimmeria, Menzoberrenzan, and Melnibone?
Or Red Sonja, Zaknafein, and Cymoril? See if you can find the connection.
Fafhrd and the Gray Mouser (of Lankhmar in Newton) had a lot of influence on original D&D, and originated the actual term "sword & sorcery". Also, Sheelba and Ningauble. Or Graywand, Scalpel, and Cat's Claw.