Hmmmm, new take on this;
I'd like to subvert the idea a *little*...While we have the same concept of a pure, chaste paladiness, appearances can be deceptive~
In this variant, our heroine has a wicked streak~ And a decidedly specific fetish...While she looks *and* acts innocent, the truth is rather different. When she's 'outfield', on the quests she's been dealt, well, let's just say that she takes her fun where she can find it...From the very, *very* manly monsters she defeats. This one would be *very* much the opposite of the NC theme of the other idea, with the girl being the domineering one~ Her would-be attackers might get a lot more than they bargained for.
-After all, the paladin's code doesn't apply to sexual misconduct. I'll like to mix it up, a little, but the main idea would be the concept of having the roles very much reversed- If the girl herself is ever defeated, of course, things would most likely proceed as normal...Though she might be far, far more willing than she's letting on. ^_^
We could have the overall quest be her attempt to disrupt a humanoid invasion, by defeating the orc warlord who plans to sweep across the lands with his invincible horde...Except her idea of 'defeat', and the ways she'd take to accomplish that goal, might be *very* different. Who's to say she can't have some fun with the warlord before killing him~? It's not like anyone would ever know...Right? In this way, her constant clashes with the monstrous races might be her way of working off steam...Which might ironically be the *very* reason why she's considered a paragon of virtue. -_^
Unrelated, but fun: http://gelbooru.com/index.php?page=post&s=view&id=724000