Xehanort is the main antagonist of the "Xehanort Saga" of the Kingdom Hearts series in a diversity of incarnations:
- Master Xehanort is a Keyblade Master, the main antagonist of Kingdom Hearts Birth by Sleep and also the main antagonist of the Xehanort Saga.
- Terra-Xehanort is the result of Master Xehanort's heart possessing Terra, an apprentice of Ansem the Wise, and a supporting antagonist in Kingdom Hearts Birth by Sleep.
- Ansem, Seeker of Darkness is Xehanort's Heartless with Terra-Xehanort's characteristics, and the main antagonist in Kingdom Hearts and Kingdom Hearts: Chain of Memories.
- Xemnas is Xehanort's Nobody with Terra-Xehanort's characteristics, the founder of Organization XIII, and the main antagonist in Kingdom Hearts II and Kingdom Hearts 358/2 Days.
- No Heart is a data simulation of Xehanort's Keyblade Armor, and it is fought within the "Foresight unto Darkness" battle in the Mirage Arena.
- Young Xehanort is an alternate-timeline version of Xehanort with the ability to travel through time and the main antagonist in Kingdom Hearts 3D: Dream Drop Distance.