LazyDolphin
Scooby
The idea of Angel isn't "stolen" from Interview with a Vampire. The idea of the brooding hero with a cross to bear is an archetype. Angel and Louis are both heros of that archetype who happen to be vampires, since they appear in works ABOUT VAMPIRES. There are thousands and thousands of other heros of that archetype throughout literature, tv and movies.
Just like there are really only seventeen basic stories in the world, and all stories are a variation on one of those seventeen, there are also a finite number of personality types. Using archetypes allows you, as the viewer, to immediately respond to and identify with characters as they are introduced. One of the strenghts of Buffy is the way Joss took arcehtypal personalities (the "insecure nerd", the "popular bitchy girl") and toyed with them and made them compelling and interesting and eventually allowed the characters to grow.
Just like there are really only seventeen basic stories in the world, and all stories are a variation on one of those seventeen, there are also a finite number of personality types. Using archetypes allows you, as the viewer, to immediately respond to and identify with characters as they are introduced. One of the strenghts of Buffy is the way Joss took arcehtypal personalities (the "insecure nerd", the "popular bitchy girl") and toyed with them and made them compelling and interesting and eventually allowed the characters to grow.