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Bold Person, Daring Person, Extraordinary Person
If you look back in history and see someone whose greatness seems sooo luxurious to you, they're probably a hero. Not just a normal person, but like Hercules or Mae Jemison.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
Who do you think the greatest hero in Japanese history is?