War Machine
War Machine is the ultimate long ragne character. Teamed with Mega Man, they can be an unstoppable force in this game. With all of the projectile attacks that this guy has, just play keep away. If you get into close combat, use a really long air combo to get them away from you.
Special Attacks
Shoulder Cannon - QCF+P or K (P for a standing one, K for a crouching one.)
Repulsor Blast - HCB+P
Smart Bombs - WK+MP
Rocket Boosters - QCB+2K (Allows you to fly, you can't block while flying.)
Super Attacks
Proton Cannon - QCF+2P
War Destroyer - QCF+2K
Combos
QCF+2P, QCF+2K, QCF+2P
This is a painful long combo that requires super canceling. All you have to do is use a Proton Cannon, then a War Destroyer, then another Proton Cannon.
FK, QCF+2K, QCF+2P, QCF+2K
This is another combo that requires super canceling. Launch them into a War Destroyer then cancel into a Proton Cannon, then do another War Destroyer to finish.
D+LK, D+MP, FK, U+WP, WK, MP, MK, U+FP, QCF+WP
This is a basic air combo. Start off with 2 hits into a launcher then 4 hits and then an Up and FP into a weak Shoulder Cannon. From here you might want to do two more Shoulder Cannons, a Smart Bomb, another Shoulder Cannon, land and then do a ducking FP, another Shoulder Cannon, cancel into a Proton Cannon, cancel into a War Destroyer and finish with a final Proton Cannon cancel. This alone my chip the opponent to death. If they don't die, at least they suffered massive damage. If they didn't block any of this, they should now be called an idiot and laughed at.