Fighting Skill: This isn't really an ability, but Sensei translates most of his martial arts training from real life into the game. While his knowledge of technique is impressive and serves him well, his fighting style is limited to the natural laws of physics. So, he isn't doing any midair 360 quintuple crescent kicks any time soon.
Meditation: This ability allows Sensei to boost all of his stats a small amount for a short period of time. The longer he meditates, the larger the boost and longer the effect. However, while he meditates, he will be vulnerable to all attacks, and if he is attacked while meditating, his focus is broken and the effects of meditating will not occur.
Chi Pulse: Sensei's only ranged attack. After using time and energy to charge the attack, he releases a pulse of energy from his hands. This will deal a small amount of damage to a single opponent and has a chance of stunning them for a short period of time. Just think Dragon Ball Z, except somewhat less impressive.
Knockout Punch: This is another of Sensei's charged abilities, but unlike the others, this ability is charged through obtaining combos (multiple consecutive hits on an opponent) or killing opponents. Generally, he either needs to kill at least 3 opponents or perform a 10-hit combo in a small time frame without taking any damage. Once the ability is charged, it can be unleashed at any time. Unleashing it will cause all enemies near him to gain temporary blindness and deafness for a short period of time.