it'll look like an accident, i could be decent yet
Severus Snape (having recently celebrated the 12th anniversary of his death - isn't that nice), is in Xanadu quite often, not that you will have noticed. He keeps to himself, and only really communicates with his clients. Every so often he is ensnared by some alternate who thinks they know him, but by and large, he is content existing as a ghost. A very cranky, antisocial ghost.
Today, Severus is making a stop near the Agora to adjust his (small, simple) advertisement on a particularly convenient wall that always seems to exist. He hasn't done so in over a year's time, and with all the geographical shifting of late, he's found it prudent to finally give it a go. On the surface, it appears that he's doing nothing but passively reading the things tacked up or magically affixed to the wall, but a closer look will reveal the not-quite-absent tapping of the fingers of his right hand against his crossed arms, and the way a small black placard's gray text shifts when he does.
Of note, for the supernaturally inclined: this particular wizard is personally warded to hell and back, wearing enchanted (and sometimes cursed) artifacts, and his boots, though cleaned, still smell like the blood of werewolves. This is on top of the ever-present faint scent of formaldehyde and death. He is dead, though breathing and heart-beating, and may seem off because of it.