Edit: Allow me to rephrase. As someone who’s never seen this show, never read the manga, knows none of the characters or plot points or literally anything else about the intellectual property of Naruto (it is Naruto, right?): what
So there’s this guy Orochimaru who does fucked up experiments on people he keeps in cages against their will, mostly children. Real body horror human centipede type stuff.
He becomes of the good guys and everyone is glad to be his friend. The other Mengele is his protege/sucessor
This leaves out the part where they are actually useful to the Leaf. Orochimaru even goes on to reconstruct the Hashirama plant thing and Kabuto fosters Not-Uchihas.