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Viper - Viper's most effective attack could be the fast and instantly airborne Burning Kick. You do this attack by jumping toward your enemy and attacking with the Burning Kick right away. The jump arc of the attack will be noticeably decreased and your character will move across half the screen width and attack immediately. You should knock down your enemy and kick-wide the door for additional attacks (this attack is pretty safe if blocked also).
Follow this attack with a High Kick in the air or ground, if your opponent blocks the attack, cancel the attack (while still in motion) into a Burning Kick, which will move very fast across the screen and hit your opponent. If you land the Burning Kick, immediately add her Ultra combo, it will take timing, but it's so nice to execute properly. Keep pressuring opponents with low kicks, and get use to blocking with her; you'll need to block to survive.
Abel also has a special cancel trick that you should use to make opponents block, and then she can move in for a quick throw (just tap any two punches right after executing a Thunder Knuckle or Seismo-Hammer and Abel will quickly stop her attack and recover immediately).