It's a toxic, but it's behaviour is more befitting of a shadow spirit. Oh, and it has a particular hate-on for elves, magicians and elven magicians.
Last time I checked, it was raising hell in Denver, presumably trying to pass any blame on Harlequin's anti-Ghostwalker campaign. It's all buddy-buddy with Puck and it's hinted that it started to create some sort of network or organization. Before that, it was in Seattle, siccing Spikes and Rusted Stilettos on the Ancients. I don't remember anyone taking care of Gwynplaine, although Ehran tried to reason with Harly and get him to do something about him.