Here is my idea:
Class: Rage Master
Weapon: Double-bladed Staff
Elements: Wind/Shadow.
Unique class mechanic:
-Have no Chi bar
-Have a Rage bar which is empty. Some strong skills will fill up the bar, while some weak skills will decrease it. Rage bar will also get filled when you're "Annoyed" when CCed, and decrease when you iframe.
-The higher your Rage bar is, the stronger your characters become.
-When your Rage bar is filled up, your characters enter Maximum Rage, become extremely strong with all offensive stat increase drastically.
-However, your buff is double-edged: has a timer. When the timer runs out, you explode, cause huge damage and die, entering Chi Recovery state. There is a long-cooldown buff that allows you to escape this danger.
-The gameplay of this class requires you to manage your rage bar very well.
Wind build: Sustainable DPS. Revolve around edging your character to very near the brim of the Rage bar, or at least keep your Rage bar in control. You have skills to support your Rage management, with a buff that allows you to spam your strongest skills while locking your Rage at 99%.
Shadow build: Burst DPS. You actually venture into state of Maximum Rage to deal very bursty damage. Your skills will help to keep you in Maximum Rage state as long as possible before you escape from the state, and also reduce the cooldown of your long-cooldown escape skill. Whenever your rage-escape off cooldown, you will enter Maximum Rage again.
Difficulty: Not newbie friendly. One mistake in Rage management and you enter Maximum Rage without your rage-escape skill on, you die with a burst.