I might be a little bit much to ask, but I would like to see an alternate character other than the current 12 that you can customize. For example I could look like a Lawbringer with a Nobushii weapon and Valkyrie's move set. I was also thinking that this would only be allowed in a certain game mode. Now if this actually became a thing there will most definitely be some OP characters so maybe those character combinations would be nerfed/banned or some thing to that effect. To me that would add another cool factor to the game. I know that this post doesn't iron out all of the facts, but I may not be the only one who would think this would be awesome. Feel free to add to this idea.
Not possible.
This game is about skill and reading your opponent. A big part of this is knowing who you are facing. If the opponent is looking like a Lawbringer but has moveset of the Valkyrie it would be impossible to block proper. It would be a guessing game each time, is this a true Lawbringer or is it a Valkyrie or a Nobushi? By the time you figure it out your dead.
What I do want is more customisation options. Hair color for one! But also more difference in looks without losing the ability to see what class it is.
Like change Bezerker mas into a helmet, makes the differences much bigger but still very clearly a Beserker.
Right now a lvl 1 Bezerker hardly looks any different from a lvl 20 Bezerker or prestige 3 Bezerker.
your idea is maybe good when it would not be a competitive game. as rudomm23 said, you have to see what you are up against to know what you can do and what you should not try to do.
besides the attacks and cains make also sence in a realistic manner, you can not wield a nobishi speer like the short speer the valkyr uses. looks pretty similar in the game, but in real it would be totaly different. ok you even see that in the game. nobishi needs BOTH hands to use that weapon. or a odachi of the kensai wield like the longsword of the warden, simply would looks strange and wrong to anyone who knows a bit about swordsfight.