Your character must never do anything bad. The assassin cannot be the hero, the felon cannot be the hero. They must be the villain. (Actually, I'm writing two stories, one where a felon is a heroine and one where an assasssin and someone who caused the apocolypse are the heroines). Your hero is the "chosen one" because he is sinless and pure of heart.
"Beautiful" means one thing, and one thing, only. For a girl:
An hourglass figure, a small nose, wide eyes that are never hazel, brown, gray, blueish-green, or a regular blue. They are always sapphire-colored, emerald colored, or, if you're feeling aventurous, amethyst-colored. They have an oval-shaped face that is described as "delicate". They must have long legs. Their hair must be long, and it has to be golden. Not brown. Not dirty-blonde. Not platinum-blonde. Not red. Not auburn. Golden. And always long. Anything shorter than waist-length will not fly. And preferably straight. Second-choice is curly, but wavy is way too plain. And any unlabelable hair textures (such as stringy and always mistaken for dreadlocks (Like my hair)) is unthinkable. Their skin must be "fair", and is cannot have any of the freckles that fair skin almost always has, it cannot have the pimples that come from adolescence. If the female does not pass this test, they are not attractive. So, even if it's a modestly-curved girl with wavy red hair down to the middle of her back, a round face, a nose with a slight point, hazel eyes, and a few faded freckles, she is an ugly hag. Even if she's be considered attractive in the real world. Unless it's a villain. Then, her skin must be "pale", she must have black hair, MUST, it MUST be straight. And her eyes must be black or "bloodred"/"ruby red". Or else she's not beautiful.
Which reminds me. There is no gray area between drop-dead gorgeous and butt-ugly. There is no "slightly-ugly", there is no "plain", there is no "average" there is no "pretty" or "attractive". You're either beautiful or a hag. Case closed.
The female can get anyone to do anything by batting her eyelashes.
Weapons:
The heroine must never carry a weapon. EVER. Only the hero can do that. And it must be a sword, the most valuable one in the world. No daggers, rapiers, axes, spears, lances, scythes, or anything. And ABSOLUTELY no broken swords, even though being broken probably makes it sharper and more deadly. It must be a sword. And it has to have jewels along the hilt, never mind the fact that it's completely unnecessary.