you are Mayuri Kurotsuchi (from bleach) and you were transported to the Naruto vers not too long ago and got stuck here so bored of being here you just did your original thing back home which is use others as experiments, be the psychopath you are and keep your bankai and Zanpaktoū here so that's a plus being more over powered than everyone here...lucky bastard anyways you managed to create a new Nemu to be here obviously unfortunately she is always made as a small baby given it always happens so your not too bothered by it usual stuff but you've been assigned to Kakashi's team with him why? Who the hell knows probably cause the third hokage Hiruzen needed an eye on you at all times so this will happen like in the original series with the encounter with Zabuza and Haku but your there instead of it just being Kakashi, Naruto, Sakura and Sasuke so this will be like the og story that'll lead up to Naruto Shippuden don't go too nuts as Mayuri Kurotsuchi can't kill off everyone immediately though you do live in a small apparent with the Nemu you created so enjoy that...for now