I'd say it can be as loose as the players decide. But mostly I mean, I'll be using 3.5 as a basis, but if I mess up or think a particular rule doesn't fit my style, then I'll alter slightly.
I'm willing to say any character will fit, unless someone finds a way to make me regret it.
The plot is a basic quest for magical artifacts. Each artifact will have it's own back story, powers, and guardian. There is no final enemy to face, no reason other then glory to collect them, at least nothing the characters know about. After discovering the first artifact it will revealed to be part of a legendary warrior's equipment, that he was buried in.
Also, if the players are interested in adding a sexual element, I can work it in. Just give an opinion and limits.