1) Remove the Peacekeeper's Catapult Feat, and replace it with the Nobushi's Arrow Strike. Make her dash cost a certain amount of stamina. Give other characters a way to counter her Light Attack Spam.
2) Remove the Valkyrie's ability to constantly chain the Heavy, Shield Bash mix-up over and over. And make her Shield Tackle slower and easier to dodge. Also have her stamina drain a significant amount if it misses, similar to the Shugoki losing health if his Demon Grab misses.
3) Make the Warden's ability to cancel his Shoulder charge into a Guardbreak cost extra stamina. And/or remove the Guardbreak's ability to track.
4) Make the Warlord lose accumulative stamina with multiple successive Guardbreak attempts. And make his Headbutt slightly slower.
5) Have the Berserker's ZoneAttack stun 'im after executing it- at least while locked onto an enemy. You can't spin that many times without getting dizzy. And nerf his Viking Fury- make it so that it doesn't last as long and have it's duration be reduced with each Heavy Attack.
6) Have the Kensei's "Unblockable" Feat only be usable for a specific amount of attacks. There's no time limit, but it drains with each sword stroke.
7) Nerf the Kunai, Yumi, Javelin, and Throwing Axe. Add a small amount of bleed if you have to- just reduce their base-damage by a noticeable margin.
8) Give the Conqueror the ability to Shove (a la Lawbringer) directly after blocking an attack while he's in Full-Block mode.
9) Make certain character's stamina reduced more significantly when trying to Guardbreak certain other characters. For example, the Peacekeeper, Valkyrie, Berserker, Orochi, and Nobushi should have their stamina reduced twice or thrice as much when Guardbreaking a Shugoki, Raider, or Lawbringer. Have it make some sense as to weigh and leverage. At the same time, some characters should be able to Guardbreak certain other characters with NO stamina drain. Again- according to weigh and leverage.
10) Give the Berserker the ability to dodge-roll when not locked on without draining their stamina. Same with the Peacekeeper. And Orochi.
11) Make the Conqueror's Charged Heavy Attack do slightly more damage. Either that, or simply add on more damage the longer the attack charges up.
12) When a Valkyrie leg-trips characters like the Shugoki, Lawbringer, or Raider, it should cost more stamina than usual. In reality, trying to do that against even a PEACEKEEPER would be extremely difficult- taxing, to say the least. You can't exactly get very much leverage when trying to trip someone up with such a thin pole. It would require a ridiculous amount of upper body strength, and the Valkyrie is HARDLY a body builder.
13) Revenge. Make it more difficult to gain, so as to reduce the chance of it happening in 1v1s. Also reduce the amount of bonus damage it does.
14) Significantly reduce the speed at which the Warden, Orochi, Warlord, and Peacekeeper execute their Zone Attacks- at LEAST while locked on to someone. Conversely, speed up the Kensei, Lawbringer, and Conqueror's Zone Attacks while locked on to someone.
15) When the Nobushi kicks someone, the amount of stamina it drains from her should be scaled according to the height, weight, and general size of the character she's kicking. Kicking a Peacekeeper or Berserker should cost almost no stamina, kicking a Shugoki or Lawbringer should cost much, much more.
16) Have the Orochi’s Heavy attack do less damage if it came directly after a Guardbreak.