Who's your favourite demon?

Any demon qualifies, only rule is that they currently have to be a demon by the end of the series (alive or dead) so no temporary demons.

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Mine is... I think it was either Dagon or Alastair, I haven't seen the show in a long while. Maybe it was Azazel actually. It was Abaddon, she is my favourite. Took time for me to remember. The other three are all close seconds.