Slender Man
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Before Itachi became the Solo King, I believe he inherited skills from the one and only Mr. Shisui "One-shot" Uchiha.
What we know about Shisui:
- Good speed/shunshin
- Good genjutsu (Kotoamatsukami)
While Teenage Bee can react to FTG, as an adult Bee is caught off-guard by Itachi's shunshin blitz:
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Itachi is also good at genjutsu; he has a 5/5 in the genjutsu stat, he can cast genjutsu without his eyes, and he possess the ghastly Tsukuyomi (plus the Sharingan crow).
Shisui could perform long-range genjutsu and the manga also confirms that Itachi can do the same:
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Of course, there is other aspects to Itachi like Shurikenjutsu, Susanoo, etc but do you really think it's a coincidence he just happens to excel in speed and genjutsu...? I didn't think so.