Well. I was doing besieged today, the trolls, and I was tabbing around H-8 when I targeted a name. ...No person or anything, just a green name, Mikan.
I tried to click it but it did nothing, the name didn't even go away. I would have taken a screenshot, but as usual my screenshot space was filled.
I just found this to be pretty interesting. I was wondering if anyone else has seen Mikan the Invisible NPC. ^^