9. Buffy The Vampire Slayer - Buffy Summers And Angel
Much like the previous entry, this one started off well enough. The plot featuring a vampire and the girl chosen to destroy his kind falling in love quickly became popular. But then the relationship got to be where it was dominated by brooding and angst. Oh, how they wished he weren't a vampire and she weren't the Slayer so they could live a normal life together.
And then in a flashback episode, it was revealed that Angel had been watching Buffy from afar before they actually met. Now, being that he's supposed to be immortal, a big age difference is probably to be expected in just about any relationship he enters into. However, this gave it a feeling of an older man stalking a teenage girl. It's something that a lot of people have found difficult to look past while trying to get engaged with their story.
Eventually Angel became the title character of his own spin-off, and Buffy would go on to fall for another vampire in Spike. Her relationship with him is generally more popular among the fans, though not without its own issues. Angel went on to fall in love with Cordelia, the once shallow cheerleader while on Buffy the Vampire Slayer who became his best friend and closest ally on the spin-off.