Quantum physicist Lin Zhou traveled to the world of Naruto during World War III and became a baby Senju Takuma, with "source energy" hidden in his body that can control molecules and analyze chakra.
He wandered between good and evil, circled in Konoha's machinations, interacted with Kakashi, Itachi and others, conquered forces, controlled capital, and stirred up the turmoil in the ninja world with power beyond the rules.