Brother of teenage starfucker Lilly Kane on "Veronica Mars", best-friend of Logan Echolls, dated Veronica Mars. Usually is nicknamed Donut by Lilly. Fans call the relationship between Duncan and Veronica "DuVe"
You: "Which one's better with Veronica? Duncan Kane or Logan Echolls?"
Me: "Well, Veronica 1.0 Duncan, but kick ass Veronica 2.0 Logan."