His story, in a nutshell, is that he is a spoiled rich kid (he's around 19, also, he may already sound like Ken but stick with me here), whose parents have paid for many high-end martial arts classes, even sending him around the world to learn from the masters. However, his lack of discipline and his inability to avoid becoming bored keeps him from ever achieving any mastery of any one fighting style. Due to this, his fighting style is a mixture of the many classes he's taken, though his appreciation for Muay Thai shows through (it's the style he learned the most about before becoming bored).
However, he hears of a World Warrior-style tournament and sets out to prove
that just because he hasn't mastered any one style doesn't mean that he has
no discipline.