Again it seems many people don't get Honedge and Doublade, it is not wielded or is going to be wielded by anything else.
The sword itself is so evil, it comes to life and wields itself to kill things.
And those eyes and grins, they are projecting a fake emotion, they are actually the blade edges. It is trying to hide its cold blooded malice when the blade is drawn, its true expression to kill everything.
It is one of the most badass concepts in Pokemon, a pair of swords so bloodthirsty, it dual wields itself to kill everything.