Disclaimer: Don't own it.
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Uchiha Shisui is three the first time he learns his father is a legend; one of the six who worked with Tobirama himself, the Second Hokage. They're renowned for their power, strategy, genius; but most of all, for who two in particular turned out to be.
One was Shimura Danzo, an exceptionally well-known fuuinjutsu and genjutsu user, as well as a former ANBU captain; another, Akimichi Torifu, one of, if not the, most talented users of the Akimichi clan's techniques to date; Hiruzen Sarutobi, who would in the future be known as one of the Gods of Shinobi, as well as the Third Hokage and the sensei of the three Sannin; Utatane Koharu, known for keen senses and espionage skills; Mitokade Homura, famed strategist; and, of course, Shisui's own father—Uchiha Kagami, master of the Sharingan and known for genjutsu skills.
When his father tells him the old stories, darker ones of war and fighting, but also light ones of campfires and laughs, his eyes grow wide upon hearing them; all he can think, and consequently say, is "Whoa." Which, of course, when it's coming from a three-year-old child, is about the highest form of praise and awe possible.
His father chuckles and smiles, deep gray eyes crinkling around the edges as strands hair fall into them. He ruffles his son's hair, which is the same colour and style—jet-black and always messy—as his, and tells him, "One day, Shisui, you'll be a legend yourself."
Shisui doesn't believe him.
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Kagami turns out to be right: twelve years later Shisui is known as Shisui of the Body Flicker, famed for his prowess with the Body Flicker technique and also for his stellar genjutsu, much like his father. He's also known for his powerful Sharingan, and the technique it grants him: Kotoamatsukami, hailed as one of the strongest genjutsus in history.
Even so, Shisui still doesn't believe his father; still doesn't believe he's a legend.
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He does, however, think a young boy will be one someday; he's walking through the village, and a young blonde boy passes him. Shisui keeps walking, but the boy turns, cerulean eyes wide with awe. "Whoa," he says, mirroring Shisui's own words to his father, "you're Uchiha Shisui. You're a legend around here!"
Shisui has stopped and turned to face the boy; they're standing still in the crowd, people shooting them looks, but they both ignore them. "Eh, I'm not that brilliant," he says to the kid—Naruto, he remembers; he's seen him around the police station a few times, brought in for vandalism.
Naruto shakes his head vigorously, sun-bright hair flying from side to side. "Yeah, you are! You're awesome, with the whole transportation thing and genjutsu."
Shisui laughs and smiles, an exact mirror of his father, and crouches down to Naruto's level. "Yeah? Well, I bet you'll be better than me when you're my age; I bet you'll be greater than the First." He's not sure why; he just has this feeling that Naruto is destined for greatness. He reaches out, ruffles the kid's hair; he's oddly sure of his words, in a way he's never been before.
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Two weeks later, Uchiha Shisui's body is found in the Naka River, suicide note by his side; he's fifteen and a prodigy, and nobody knows why this happened. Later, his body will disappear to places unknown, and he will always remain a mystery.
Nine years after that, at the age of seventeen, Uzumaki Naruto is a legend; like his father before him, Shisui was right.
