Dorian is a truly twitchy fellow.
He wasn't always a deer and just appeared one day in the forest, claiming he came from a place called Willowhill Asylum. What he did in this asylum, no-one knows, but it obviously left him very scarred and mentally unstable.
He jumps away from anyone trying to touch him, even if it's just a friendly nuzzle or swatting a fly away from his often re-opening scars.
Extreme paranoia has left him mentally shattered to the point of almost not being able to function properly through the day.
Not to mention his immense fear of touch, which socially handicaps him even further, making him never allow anyone close enough to touch.
The ones who do get close enough will get kicked and bitten at with a surprising furiousness and desperation of a deer faced with a gun barrel.

The only people he'll allow to touch him are a select few extremely trusted individuals. He's gotten a little more comfortable with touch through his time in the forest, but he still only allows those special ones that privilege.

When in heat, he will smell entirely of doe, since that is essentially what he is mostly. His insides are completely female, though growing up in a harsh environment, he found it easier and safer to be a boy.

Has the ability to change back into his human form, but doesn't know how to control this. He sometimes does it without knowing it and the logic behind it, if any, still eludes him.

He can also change into a dragon as a result of his DNA being infused with EMR's infection, the original reason of this having been to make him immune to fire so as to survive the massive burns inflicted upon him by the virus.
He can control this form freely, but isn't aware of its existence. He sometimes changes into it when running away as he gains a speed-boost in this form, the particular breed of dragon being a prey-animal, the deer-version of dragons, more or less.
His mentality becomes that of a lesser animal in this form, a dog or a cat, and he's more prone to let people touch him as he also becomes slightly more mellow and his more illogical fears subside.
He can breathe fire and soar in this form, but he's actually less likely to injure anyone as a dragon than as a deer or human.

He will sneeze off his mini-spell to symbolize this form, as he grows a few inches, becoming the size of an average TEF-stag. (number 2.)