Cobra Kai

"Cobra Kai, or 'The Way of the Fist,' is an aggressive, strong, merciless style of karate. Its founder, John Kreese, learned hand-to-hand combat from Captain Turner, who learned Tang Soo Do, a style of martial arts similar to taekwondo and karate, from Kim Sun-Yung. Cobra Kai karate is heavily kick-oriented and focuses less on self-defense; instead, students are taught the best defense is more offense, diametrically opposed to Miyagi-Do Karate. Students are taught to 'finish' their enemy and strike when they are weak, and that the fight is not over until they say it is."

The Best Defense

If an enemy attacks you with a melee attack during their turn, you can spend 1 ki point to take a reaction and use Unarmed Strike on them, ending their turn. If an enemy attacks you with a ranged attack, you can spend 1 ki point to take a reaction and catch the projectile if it fits in one hand, close the distance between you and the enemy if it is within your speed, and deal Unarmed Strike, ending their turn. This Unarmed Strike deals whatever type of damage the projectile deals. If an enemy begins casting a spell, you can spend 1 ki point to close the distance between you and them, and deal an Unarmed Strike, and attempt to break their concentration. If you succeed, their turn ends.

Anticipate

If you are fighting an enemy and another enemy makes an attack roll on you, you can spend 1 ki point, and you can use a reaction to perform Unarmed Strike on both, and any attacks are cancelled. If the other enemy is using a ranged weapon or spell, you must spend an extra ki point to dodge their attack. If their attack roll is higher than your original enemy's AC, the enemy with the ranged weapon or spell hits their ally, surprising them. 

Quick Silver

 You gain 3 actions

1. You can spend 1 ki point and use Unarmed Strike to sweep your enemy's leg. They must succeed on a Constitution saving throw of 8 + your Dexterity modifier or be knocked prone.

2. You can spend 1 ki point and use Unarmed Strike to punch your enemy's Solar Plexus, knocking the wind out of them. They must succeed on a Constitution saving throw of 10 + your Dexterity modifier or be unable to make an action or reaction for 1d4 turns.

3. You can spend 1 ki point and use Unarmed Strike to hit your enemy square in the nose. They must succeed on a Constitution saving throw of 12 + your Dexterity modifier or be "Blinded by their own tears and choke on their own blood." (Gains Blinded condition)

No Mercy

You can spend 2 ki points to have advantage on all attacks this turn, and all damage rolls have +3 for this turn