Spidey-Sense: there's a lot of chit chat about whether you could pull in wanda's mutant cross-canon origins and play with them a little here, or whether she's purely human and a full-on science experiment, or whether she's kind of a hybrid, and the mind stone simply awoke powers that were latent in both her and her brother, which is why they survived hydra's experimentation when none of the other volunteers did. she's not the kind of "witch" buffy is used to, but with her powers still growing in canon, she nearly veers into supernatural territory. i would say it's fair for buffy to sense something witchy about her!

Demonic: i don't think this will affect their skills or powers against or in alliance with each other; and while wanda can ultimately sense an essence coming from certain characters, i think we can decide when/where we want this particular topic to come up while chatting. wouldn't want to just spring it on you in any thread at random! yay plots!!!