I know that the alignment required for "the champion of torm" can be changed, but how about the assassin class? I don't think it will be an issue yet, (I'm not close enough to the prestige class yet,) but could you change the alignment required for the assassin class? I want a character that's not really evil, but kind of misled. (If youv'e seen serenity, and know the black guy assassin guy that works for the government, then you know what I'm kind of going for.) It that's not possible than that's okay, I would just like to know.

You can be an assassin without being Evil. Just kill people for money, or politics. However, if you want to be an Assassin you need to be Evil. The benefits of the class come from the character being a callous murderer. No buts!