A few Ideas

Stats: As many people have already stated the parry build has become the build of a majority of the population and yes it has been nerfed but it hasn't stopped the problem of everyone making that form of style. I say that more stats should be buffed. Such as offense being able to break through defense (May already do this but i havent seen it) Also speed helping to avoid parries and maybe pierce through them. By doing this it will increase the chances for people to turn away from the parry builds and make more variety which will create new and inventive style builds thus increasing rp.

Weapons: I think that with your styles there should be a point where your style has been ranked as master level and at this point you can create a weapon that is accustom to your style such as a hand to hand fighter can create gloves/gauntlets exclusive to the style that can only be used when the style is active. (Sort of like the shigure kintoki from hitman reborn) The master of the style can then pass the weapons down generation to generation of the style headmasters. For the weapons icons must be provided by the person applying.

Duel Mode: This may be a tad bit out there so bear with me. Maybe there should be a mode that you can go into that would allow you to attack people. Two people must be in this mode for fighting to take place. I suggest this because with all the random killings that have been going on anyone can just do a rp and attack someone until they die, especially the assassin group that sprung up yesterday. Now I realize there are many problems with this and it can limit the actions of players but if there was someway that you could possibly work with it?

Style Training: With the way it is setup anyone can create there own style and just stand in one spot and punch endlessly and increase there style prof thus making them strong. This limits rp severly because no one rp's to train there styles or actually become strong by rping they fight someone lose and then stand there for hours on end punching the air until there style increases to a point where they can just defeat anyone. Maybe there could be a limit to the amout of prof a rank can get just by training alone. A daily limit perhaps or once your style reaches a certain prof your style will lock and you have to teach someone to progress? This would promote rp to a point and hopefully get rid of people who just constantly spam the A key.

Some of these Ideas may of already been submitted but i just thought that i should give my take on the situation.

Okay...Let's see. I can see where you're going with the whole limiting style-training, but if that was taken out, everyone would end up sparring anyways. Perhaps, as you said, a lock on it, or style points could be rewarded by admins for good RP or good training.