Hadoken

The Hadoken (波動拳) is a move from Capcom's Street Fighter series of fighting games that was included in as a secret power-up obtained from a Light Capsule in Mega Man X, Maverick Hunter X, Mega Man Xtreme and Mega Man Xtreme 2, and is executed in the same way, inputting the combination ↓↘→+ATTACK while X's health gauge is full and he is on the ground to unleash a powerful energy ball. It causes 32 damage, being able to destroy most bosses and enemies in a single hit. Appropriate to the attack's origins, Dr. Light's hologram appearance when unlocking this Light Capsule depicts him wearing a Martial Arts gi instead of his standard lab uniform. In the original Mega Man X, using this ability will have X say in a high-pitched, quick voice "Hadoken," marking the only instance of audio speech in the game. According to Light in Maverick Hunter Mega Man X, X is the only known Reploid capable of utilizing the Hadoken, as it is fueled by one's spirit, through which X has due to his near human centered programming and capability.

In Mega Man X4, the Hadoken is one of Magma Dragoon's attacks. In Mega Man X: Command Mission the bosses Ninetails and Threetails use the Annihilator Hadoken (滅殺波動拳 Messatsu Hadoken). In Project X Zone X uses a powerful Hadoken alongside Zero's Genmu Zero.

Street Fighter X Mega Man
Hadoken is Ryu's special weapon from Street Fighter X Mega Man. When used, Mega Man will release a small and slow Hadoken, and can be charged to shoot a quick yellow Hadoken. The Hadoken is the ideal weapon against Chun-Li, M. Bison, and Akuma; though the charged Hadoken inflicts extra damage to Akuma and M. Bison, Chun-Li only incurs regular damage.

When fighting against Ryu, an uncharged Hadoken from Ryu can be negated with three Mega Buster shots. Hadokens of any magnitude can be reflected with the Aegis Reflector.

Archie Comics
Ryu employed the Hadouken during his appearance in Worlds Unite, notably dispatching Vanishing Gungaroo with a single blast.