Yui Kuroshio
Yui was sitting at a dark table near a corner of the guild hall, watching all the goings on around the guild. In her hands was a small shadow she was playing with absentmindedly. Yui watched the new girl as she spoke to the guild master, chewing on what Yui thought was some sort of candy. Then suddenly Tatsuo barged in the guild hall, that stubborn ass, and proceeded to beat up a bunch of people just because he's insecure. 'I swear, Tatsuo is gonna kill someone eventually' Yui thought to herself.
Yui's attention shifted back to the girl talking to the guild master, something about her seemed strange and Yui's curiosity got the better of her. No one noticed as Yui melded into the shadow on the wall behind her, and slowly moved across the room towards the guild master and the new girl. Of course Yui could have just walked up to them both to see what was going on, but that would involve speaking to someone Yui didn't know, and that wouldn't go as well. Finally she had made it close enough to hear, but hopefully far enough to not be noticed, considering she was just a shadow on the floor at that point.