Just a thought experiment I had

What would it take to build an ideal hand to hand fighter? Like to be able to take on almost anyone, or at least have the best chance at winning a physical encounter? How strong would they have to be? What muscles need to be super developed? What do they need to learn? I'm short, so I guess the focus to me would also be how to take on bigger guys, but I don't want to limit responses, so just in general, what do you guys think about this?