Buffy has a "spidey-sense" for detecting supernatural creatures, especially vampires. If your character isn't human, is it okay for Buffy to sense this? If yes, what exactly might she be able to sense from your character? I'm happy to follow your lead on whether she would accurately sense a species/ability or whether she would just vaguely know someone isn't human.

Due to the way Slayers were created, Buffy has the essence of a demon in her. Does your character have any supernatural abilities that might not be effective on her because of this? Would your character be able to send that demon essence?