Before you ask, no Dracula is not one of them.

None of them are originally from movies. None of them became vampires through technological means. None from the Witcher series. All from Earth unless stated otherwise.

1 - Rachel Alucard - BlazBlue (guessed by /u/LambentEnigma)

2 - From an anime and a Manga, from a modern setting, male, dark hair, can walk in sunlight, has been in an anime. No known surname. Can transform into bats. The only vampire in the series. Takes on various forms over the course of the series. Antagonist. Main characters are teenagers and both male and female. A killer.

3 - Lady Margolotta - Discworld (guessed by /u/LambentEnigma)

4 - Eli - Let The Right One In (guessed by /u/LambentEnigma)

5 - Evangeline Athanasia Katherine McDowell - Mahou Sensei Negima (guessed by /u/LambentEnigma)

6 - Marceline - Adventure Time (guessed by /u/Coconut-Crab)

7 - Vicente Valtieri - (guessed by /u/anyalemon)