The Reizagan is almost certainly a derivative/mutation of the Sharingan. If Senko gives herself Sharingan or Rinnegan somehow, the Reizagan she's given herself will probably fold into it.
Quote Originally Posted by Lord Raziere View Post
That has been already done, Rater, check the OP under the spoiler "previous threads"

I dunno, its just an idea I'm floating out there, see if anyone is interested, what we can do with it at some point. I'm glad your interested in it and want to see what I can do to make the idea appealing and how we make their appearance and existence a plot or whatever.

but if you don't want the character to do something like start this revolution before you, thats okay to. Since being big boss sounds like the start of it and putting someone before you might ruin that?
You don't have to not do it.

I'll note that Zabuza and Haku were a big influence on Naruto in canon, and Big Boss had a number of encounters with people who were ultimately just like he ended up before going full Outer Heaven.