Burning Dusk, the front one, and Dark Volcano, the one in the back, are brothers.
They live an an area with a lot of active volcano's and work as guards of some sort.
I'm still actually trying to work out the details of them, really, but I liked it enough to post here.

Sorry about they Watermark thingy in the corner, but I posted this first on DA, and since DA isn't as trustworthy as some sites...