Here's one:
Zack was born and raised in (Insert "Place where da gangstaz be at" here) and had a life filled with hatred and bloodshed. His parents where killed by gangsters hired by a mysterious man that Zack never personally knew. (Donovan) In his later years, he got involved in the drug dealing business because of his uncle who he was sent to got him into it. In his room, Zack used to listen to all kinds of music, Classical, Rap, RnB, you name it. But the people in his uncle's home used to laugh and tease him for it. It nearly even got him killed. After he was battered, assaulted and left in the roads of (Insert "Place where da gangstaz be at" here), he swore never to be beaten by a bunch of classless street thugs, and that one day he would beat them all again. So Zack left his uncle's home and went to live in a University campus and travelled to a lot of Muay Thai tournaments just to spectate and see what was up. He was amazed at this fighting style and he ended up teaching himself it. But that was just a back-up plan. Zack really wanted to become a DJ. This is what drove him to mix various dance moves into his fighting style.
Sometime during his prime time of millions of record sales and popularity, some men came into Zack's home and tried to assassinate him, but he fended them off with his Self-Taught Muay Thai skills. When he fought them off, he saw a DOA tournament advertisment on the billboards coincidentally outside of his house.
"Well I could fight these geezers off, so I guess I've got in the bag!" Zack said.
But he was actually thinking:
"Can I actually win, though?"
For most of Zack's life, on the outside, he was a very zany and crazy guy, but that was just a facade for his extremely low self-esteem brought onto him by his bizarre past. He now tries to put all of that past him and uses girls as a distraction, (Hence DOAX Games) not to think about his past.