And magic, as she was a key element at keeping Grey Willow at bay initially.I've gotta go with Anya. She was accepted by everyone at some point and was expected to help out with research, planning, and fighting.
S10 is Spike
That's sort of the problem with Anya, though. She should have been a great asset to the Scoobies with her 1100-year-old knowledge of demons and magic and yet all she's used for is the jokes. Actually the same might be said for Tara. Really anyone outside the core four is underutilised, unless you're a vampire. But that's the thing I'm not going to argue with anyone about who is the fifth member, it's mostly a preference of character, there is no clear winner.I baffled by how many people are saying Anya. To me, Anya was never really accepted by Willow or Buffy. It always felt like they just tolerated her.