Naruto and Sasuke never knew that they were reincarnations of Asura and Indra until they were told so. However, what no one, not even their own teammate, knew was that she was also a reincarnation. (Sakura-centric) (Alchemy/Fuinjutsu Sakura) (Civilian-born ninja Sakura) (Crossposted on Spacebattles) (Not an SI)

I died and God told me that I had three wishes. But, I didn't end up getting any of them except for being reborn as Teuchi from Naruto, which I would not have wished for if I knew that that was going to be the only wish that would be granted. Maybe, I shouldn't have called Him Zeus. (Not technically an SI) (Reincarnation / Transmigration) (Civilian Ninja) (No Cheats)

"What do you think my Nen type will be?" "You are a manipulator, no doubt about it. I don't even need to see your water divination." ... I would rather be literally any other type than a manipulator. "Can manipulators at least fight?" "Ah, that is actually a very good question. Manipulators are well known for, except for a few rare cases, being absolutely terrible at fighting."(SI)

A random smart human from our Earth gets inserted into our favorite evil, eloquent, intelligent, sadistic, and powerful galactic emperor and he decides that is just fine with him. This SI has no plans to help his favorite characters out and is only out for himself in this new universe. (Evil Intelligent Villain SI Protagonist / Self Insert)(Technically not a SI)