Ganondorf is totally "THE SOLE EPIC VILLIAN OF THE SERIES" as said by M-SwordLink. Zelda as a series is based on three things:
1. Princess Zelda (DUH)
2. The Triforce (It's on the cover of TP, it's all over the place in Oot)
3. Their goddesses (Din, Nayru, and Farore, the creators of the Triforce)
4. The Sacred Realm
5. Link!!!
(OK, it's more than 3, but i thought of a bunch of new things.)
Gonondorf ties into all of those things. The Triforce is my all-time favorite element of the Zelda series. It's a TRIangle. 'TRI' meaning 'three' The Triforce holders are Link, Zelda (also known as Tetra), and GANONDORF. Not Link, Zelda, and Malladus, not Link, Zelda and Majora. I love the concept of the struggle for the Triforce and the Sacred Realm between Link, Ganondorf, and Zelda. I love all his wacky returns and new styles. And i'd LOVE to see him in Zelda Wii.