These appear to be the only KOS mobs in the zone, to start.
Note that the animals in the zone give no faction hits and are mostly amiable to druids, at least. :)
In Cobalt Scar: (no data)
In Siren's Grotto: (no data)
In the Buried Sea: (no data)
In Brother Island: The sirens of Brother Island only come out to play at night... They'll be up from 7pm-4am in-game /time (a zonewide emote precedes their appearance). They are found along the northwestern coast and other areas underwater.