"Masaki, you're like a walking facepalm"

That's a little mean D:

Just some two cents.

The Rinnegan shouldn't be a worry since it seems to be near impossible to get from what we know from canon(sorry if this is spoilers).

The requirements are

*Three Tomoe Sharingan
*Killing your best friend/sibling/high emotional trauma to activate Mangekyo.
*Getting your brothers eyes to activate the Enternal Mangekyo
*Then getting some Senju Cells to activate the Rinnegan, and even that can take ages(see Madara)