Okay, the character looks good, but there are a few things to note:
Deck: Amazoness Deck or Exodia (Haven't actually decided yet.)
Okay, you'll certainly have to decide a deck type between the two, though it seems that you may be going for the Exodia deck from reading the Bio.
History/Background: Alistar entered Duel Academy at the Slypher Yellow stage and was swiftly pushed up to Blue when he defeated his instructors in two turns with his Exodia deck. The deck is something he only uses during high stakes matches. After graduating Alistar went on to become a well off duel monsters intercontental champ. After growing board with the simple stadium events he used prize money to have his Duel Runner made and joined the circuit as a pro.
Now, there are a couple of things here:
- What dorm did he start in? Slifer Red (the lowest dorm, only for those who managed to enter the Academy by sheer luck or by the skin of their teeth) or Ra Yellow (for those who are highly skilled, but still have lots of room for improvement). It's no major thing, but something to note.
- Defeating instructors in duels won't put someone in Blue just like that. It takes lots of skill to do get promoted. You could say that he managed to become promoted after a year (if in Ra Yellow) or two years (if in Slifer Red) and excelling in end-of-the-year exams.
- Becoming an international champ soon after graduating is unlikely unless you had the sheer skill of the legendary Zane Truesdale (which is very unlikely as he was one of the best duelists to have graduated from the Academy). It would make more sense if it took a year or two to qualify for the Pro Curcuit and begin making a name for himself. However, if he wins enough tournaments (or even be in the top three), he could certainly afford a high-quality Duel Runner in a year or so. However, he wouldn't enter the Turbo Duel Pro Circuit as a pro since Turbo Dueling is vastly different from regular dueling.