Sirrys ban Irtuus bon Alaamac is a troll, first introduced in the story The Contract from The Benevolence Archives, Vol. 1. He is Rhundi’s head researcher and a scholar of the Benevolence. He is also a fairly capable gearhead, and has been able to circumvent Benevolence technology locks on more than one occasion.
Trolls may be the oddest of the races in the Benevolence Archives. Trolls are limited shapechangers; they cannot change their overall mass or the basic arrangement of their bodies, but their limbs and bodies can change in length and thickness radically, and a troll can grow from shorter than a gnome to taller than an ogre in the blink of an eye, or extend an arm much longer than normal in order to reach something. Further, trolls appear to have multiple personalities, and often a different body configuration may respond to a different name and act very differently than the same troll at a different size. In Sirrys ban Irtuus bon Alaamac’s case, his “tall” form is known as Irtuus-bon, and is the form most people know him in. His shortest, widest incarnation calls itself Sirrys, and is much more petulant and childish. If he has a form that calls itself Alaamac, he does not use it very often.