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A ninja teacher who thinks he's the best, even though he lost a stupid game of rock-paper-scissors to Kakashi. He screams about his students like they're his babies and beats the hell out of anyone who doesn't follow his rules.
Gai just did a headstand and screamed 'I AM THE BEST!' in the middle of the street. No one questioned it.
Lee got a punishment for not doing 100 push-ups. Gai cried like a baby.
He saw Lee do the ura renge and fainted. Then he fainted again.