20th Television

First appearance: "Welcome to the Hellmouth"

Number of episodes: 56

No, Angel's not #1 — and at this point, all you Bangel fans are shaking your fists at the heavens. But really, there's no shame in coming in second. Angel is obviously pivotal to Buffy's development: her first love, her first heartbreak, her first I-had-sex-with-you-and-you-lost-your-soul drama. He also got a pretty great spin-off of his own.