Nioh 2's story is all about destiny and the long journey to find your place in the world. Tokichiro's boss fight isn't the most difficult, but it is one of the more heart wrenching of the series. Being betrayed by the character who had been a loyal friend up to this point was difficult to deal with for many players. The boss suffers from the trend of human bosses being pretty easy to take down as long as the player is well prepared.
The fight with Tokichiro is one that requires an understanding of Ki breaking and stamina management. Players with a lot of skill in that department shouldn't find this battle to be all that difficult. The boss focuses on a few powerful attacks but can be bested with enough pressure from the player. Here's how to take down Tokichiro in Nioh 2.
Tokichiro is a boss fight that is dependent on the player's ability to attack quickly and aggressively. The best way to prepare for this fight would be to grab a powerful weapon that is easy to swing, but that has some length on it. The best method for dealing with this boss is to keep hammering him with attacks instead of letting him charge up his. The player should also consider stripping some armor down or wearing the lightest pieces available. This boss has a lot of Ki, so there aren't a lot of openings to recharge.
This boss has some powerful magic attacks and a particularly nasty Burst attack. Countering this is imperative to survival. When the boss approaches, hit him with something like the Odachi so he doesn't get a chance to get too close. The twin blades will be helpful here too because they are fast and don't take up too much stamina. Keep attacking until your stamina is nearly out, then dodge behind the boss to avoid a magic attack.
Whenever there is a valid opening, players should take the chance to swing on the boss. When given the chance, Tokichiro will launch multiple Anima strikes at the player. The Monkey Anima will chase the player down if too much distance is given, so stay in close. There is also a point when the boss will breath fire in a wide arch toward the player. This has a short windup in which the ground ahead will turn read. Players will need to dash left or right out of this path and get some hits on the boss while he breathes.
Nioh 2 is available on PlayStation 4.