In truth, I should have named this part Tokichiro Fight 2, but I think he shall have his desired title here, regardless of the outcome.
Everything from this point onward is massive spoilers, so keep that in mind.
For those who have fought Hideyori from Nioh 1, this is a easier version of that fight since he does not have brutal timings, but his long range moves are crazy.
He has a really strategic move-set in fire form, allowing him almost free range of attack.
Lighting form puts him into a beserker-style attack move, and he can be relentless when in this mode.

Also, his dual-blade combo attack is really dang cool.

Like I said, not a tough fight, as my death total shows, but still a neat one, and a good sendoff boss for one of your main allies.
Also, I left the ending cutscene on this boss video because I knew it would be worth showing.
Its really well done.
I beat Hideyoshi on my first attempt.
Nioh 2 Playlist:    • Nioh 2: The Story of Hideyoshi