Itachi Uchiha
The Genius of the Uchiha Clan. Fragile but devastating, his jutsu deal +10% damage. 15% of hits find him already scattered into crows that stun anyone near him, and once per run instead of falling he comes back with half health.
Jutsu kit
Kit jutsu show up more often on level up. Some are only learned later in the saga, as in the series.
The fire dragon swoops on the nearest enemy and explodes, burning anyone around it.
A flock of crows flies around you and pecks anyone who comes close.
One look and the enemies in front of you fall into the illusion.
Plus every Academy jutsu: Shuriken Kunai Shadow Clone Jutsu Poisoned Senbon Paper Bomb Kunai Kunai Rain
Secret technique and evolutions

Secret technique: Tsukuyomi

+15 health, +15% damage, -6% cooldown
Secret technique: Amaterasu

+25 health, +1 armor, +20% damage
Secret technique: Sword of Totsuka
Secret techniques in action
Every form has its own secret technique, with its own effect. The strike hits every enemy around the ninja.
7 costumes: you'll find them with their conditions on the ninja's sheet, in the game. The almost-ready ones are in What to do now.
Possible combined jutsu
Fusions Itachi can obtain alone at the Seal Altar.
Build tips
His kit's natures: Fire Shadow and Genjutsu.
Strong against
Legendaries weak to at least one kit nature: Haku, Orochimaru, Shukaku.
Tools that boost the kit
Reach the rank of Jonin