Soul is a weapon-based fighting game series by Namco. The series revolves around a sword that, after years of bloodshed and hatred, gained a soul of its own, the Soul Edge, and the sword forged to counter it, Soul Calibur. The series is special in that each character is created to have his or her own different weapon and style creating a varied fighting experience. The popular series has spawned five games so far, with one more underway and a motion picture currently in production.
Taki, Mitsurugi, Sophitia, Cervantes, Nightmare (as Siegfried! in Soul Edge) and technically Siegfried (due to his appearance in Soulcalibur II as Nightmare and as Nightmare's third costume) are the only characters to have appeared in every Soul game to date.