I was thinking stormtrooper blaster too, before I'd even finished scrolling past the picture.
Lose the sword. A robot doesn't need one. It should be strong enough to reach into someone's chest and pull out their heart, or grab and crush their skull. If it's armored metal, an opponent with a sword is nothing to fear. Grab the incoming swing at the blade, snap it, and proceed to chest or head.
It is. And it is not. When it is, and when it is not, is the question or the answer, or both or neither.