One of his most recent summoners (a twelve year old boy) named him Dirk, so that's what he's been going by since then. He only gets to visit the mortal plane when summoned (usually for purposes of vengeance, mass destruction, etc.) so he tries to live it up while he can, before he has to get to work and then go back home. He is capable of immense destruction when he puts his mind to it, but that's mostly only when he's being instructed to by his summoner. He's basically a big, excitable dog, and would rather party, explore, and have fun with his free time. Sometimes "fun" does include a lot of violence and fire, but he doesn't mean anything by it. It's just what he knows.

Human: Tends to take on human form when interacting with people, since he can't really speak in canine form (and having thumbs is extremely useful). In this form, he's lanky and attractive, with a big toothy grin and angular features. When compared to Earth ethnicities, he seems some variety Middle Eastern (though, one that no longer exists as it had in the old days). Features that are not quite human are: lightly-pointed ears, sharp teeth, fire-colored eyes, and a body temperature that feels way too high. There is also a constant welling of fresh blood in his eyes, which doesn't usually drip down his face, but accidents do happen. The outfit that is currently bound to his body is inexplicably sort of edgy and punkish, as if a biker had crashed through a Hot Topic. Honestly, his jacket has a furred collar and everything. He has no idea why he looks the way he does (but it probably has something to do with whatever his last summoner had considered "cool").

Dog: His dog form is very malleable, the details of which sort of depend on his mood and situation. At the most basic, it looks like a massive, rangy black dog with big eyes. When he wants to make things exciting, his form can grow to massive proportions, set itself on fire, expose the bones of its face/skull, grow more eyes or teeth, etc.

Image: here

Dirk is a nigh-indestructible demon dog! He can take massive amounts of physical damage without "dying." Blowing his body apart reveals molten "blood" that tends to squish back into a Dirk-shape after a bit, healing him completely (including his clothes) over time. However, being that he is a demon, holy magic and other things specifically designed to damage and destroy demons will fuck him right up. The rest of his abilities fall into the realms of conjuring and controlling hellfire, using it purely offensively (in a variety of creative ways) or using it defensively as moats, shields, etc. He can also do a sort of short-range teleportation that can get him past many barriers, but this is also firepowered. It's more like losing most of his physical form and rushing to a new place that he's looking at than true teleportation, however, so it can be countered by various means. He's also knowledgable about various spells and rituals and can help casters accomplish them, but can't really perform them all by himself.

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