(I didn't want to use the bat-wing look so I thought I would do something similar but still different.)
Rick was furious. He couldn't believe that he had gotten beaten by Robert so easily. He had never lost a fight before, even that time when had the flu and he wasn't prepared to let Robert get away with it. Yet, at the same time he knew that he couldn't beat him. He had attacked so fast that he barely saw his arm move.
"I wish I was able to beat Robert in a fight." He thought to himself but then felt slightly dizzy. He looked at his reflection in the mirror as two giant black-feathered wings shot out of his back. His hair turned pitch-black and his eyes grew yellow and filled with an almost lifeless stare. His muscles grew bigger as he grew taller. His fingers split open with blood as sharp black claws shot out. The same happened with his toes as his ears and teeth also sharpened.
The changes stopped and Rick looked at his new body.
"What the heck happened?" He said out-loud.
"I granted your wish." Rick spun around to find a man dressed in a suit in pants standing in his room
"You wanted to be able to beat Robert and I granted it. Now you are not only stronger than he is, but also just as fast. Not to mention your ability to fly, but that probably won't come with as much advantage as you might think."
"So is this my new form?"
"No this is your hybrid form. To ensure that you would fit in with humans, we needed to make you to be able to change forms. I wouldn't take on your full form unless absolutely necesary."
"So what am I?"
"Nothing more than what you needed to be in order to beat Robert. King of all the evil forces on earth."
"Why did you give me these powers?"
"I am only the vessel through which the power flows. I do not choose good over evil nor evil over good. The true power comes from the alignment of the planets, through which the power is made. In other words, I am no more than a delivery boy. I give you what I am told to give you, answer whatever questions you have and nothing else."
"So you say that I am the king of all that is evil in the universe?"
"Not the universe, just what exists on the physical realm of this planet, Satan still controls everyone else. You are no more than a new breed of demon that can exist on earth. As for any other questions about your own abilities you should find out shortly."
The man disappeared as quickly as he had appeared to begin with and Rick once again looked in the mirror.
He smiled. Tomorrow he will get his revenge.