Eriol and Fujitaka
Eriol and Fujitaka are the two halves of Clow. When Clow died he was reborn in the both of them. It was revealed that Fujitaka himself had Eriol's shadow. Eriol often is shown watching his other self, and even saw Nedesico, Fujitaka's wife and Sakura and Touya's mother.
Eriol also gave part of his power to Fujitaka, seeing that he had none.
