1: Name: Diablo
2: Gender. Male
3: Basic description.Starting form: Landing in a new universe was not as shocking as his "new" form. The lord of destruction, (In his universe) seemed to have devolved. Standing at seven feet tall with a slight hump that is concealed by a thick expanse of muscled shoulders and arms that end at claws at his large hands. The mid section is slender in comparison to his upper and lower body, thick thighs jut out of his waist with a massive swaying tail to help the top heavy demon keep his balance.
His face appears to be a twisted visage of horror with eyes that appear to contain flames and a mouth full of razor sharp fangs, no nose and a crown of horns on his head. In this form his body just seems muscular with thick a thick red skin that "scales" along the back of his arms, thighs and back.
"Final" form (for this game)- As his strength grows so does his body, eventually "ending" at nine feet in height. He looks the same as his starting form except for a thicker torso and his horns truly jut out of his head and back. The scales along his arms, thighs, tail and lower back grow out and stick off of his body like a set of macabre armor possible of deflecting the strongest blades.
"True form" -Most likely will not be seen, since at this point he is engulfed in flames, has spikes and kills anything in sight.

4:
Background- Diablo (in his universe) is the youngest of the three prime evils along with his two brothers. They are the rulers of the hells an constant plague to the mortals of his realm, the three have ruled their world before "humans" evolved from their neanderthal origins. Diablo is young which made him a target eventually. Having been discovered and caught in his lair by a group of warriors the lord of destruction was "killed" but in an effort to save him, one of his brothers cast him out of the plane to crash into an unknown world. Most of his power is gone, he is a sliver of his former self. Most of his power is dependent on the terror and fear he can instil in the mortals and in a new world where he is unknown he must leave destruction in his wake to grow stronger and become a fear to all who inhabit this new world.
5:
Requested Strength- 4, that grows by 1 or 2 (until GM says no more, pref 17-20) with every encounter or so. Not all have to be sexual, terrorizing one to the brink of death to let them live is enough so the survivor can run off and spread the word of who attacked her/him.
6:
Sample- A roar of fury ripped from his throat as he found himself bewildered in a crater, he looked around, the land felt foreign. Diablo knew the earth well, he had traveled it all in his youth and he knew he was no longer in his realm. He recalled being thrown across the planes by his elder brother, the flashes of holy light that pierced at his flesh. Clawed hands reached for his wounds, nothing, but what he found was worse! His body, it had reverted! He was but a child again and it angered him! The creature thrashed around as he climbed out of the crater to look around, finding grey spirals and fields of rock. He traveled for a long time until he found a coast line, moving along until he felt the presence of something besides him.
He came across a group of travelers, lugging goods somewhere unfamiliar to him, they would never reach their destination. Like a bull he charged and nearly stalled when he did not feel the fear he was accustom to. There was confusion and fear, but some managed to wound him with simple weapons that should have been deflected off! He hissed in pain as arrows dug themselves into his thighs and chest, a hand batted them away before he slashed one down the middle with his claws. He was the lord of destruction! The nerve of these nobodies hurting him! The large creature (in comparison to them) charged one of the last ones, grabbed her by her throat and lifted her off the ground to watch her legs flail. He began to tighten his grip, staring into her soul with the fires of the hells in his eyeless sockets.
"You will live...tell them the lord of destruction has been born anew..."
Diablo rumbled deep into her mind's eye, the jagged rows of teeth parted in a grim smile before he tossed her down like a worthless sack. Her friends where dead, one of their corpses had been tossed over his shoulder leaving a cape of crimson blood washing down his dull red skin. The last she heard was the sound of the demon crunching on the bone of her friend's leg, the woman awoke and began to scream in agony, waking from her attack only to discover she would be eaten to death slowly...
Notes- I don't know if the variable strength will be approved, but I liked the idea of it, but willing to go with a "set" one if it seems to hard to manage.