Actually, I like the OP's idea. It's always fun to turn expectations and stereotypes on their ear, and play against type. Assassin Artemis? Tyrant Athena? Why not? The world is ever-changing, the threats are never-ending, and a harder universe leads to harder deities.The only guideline is: does it work for your game idea? If so, then the myths and stories are only guidelines, not hard rules, and shouldn't stop you having fun with whatever you dream up.