I see that you want to play Mutsunokami! Great choice, he's a fun guy to play with.
First of all, I mostly based my swords off from the game, since their dialogues there is the first layer of canon. After that, I draw from the official adaptations (Hanamaru, musicals, Stageplay) for canon information. Because their personality mainly remain the same, despite different Citadels/situations.
Above anon already mentioned Recollections, so I also suggest you check out Internal Affairs as well. Mutsunokami have unique lines with the Shinsengumi swords in Sparring, which gives a look at how he view each member.
Outside of canon, just the typical historical research into their history and their masters. So that means looking up Ryoma Sakamoto for Mutsunokami and you can see how much he influenced his sword.
Re: TOUKEN RANBU
First of all, I mostly based my swords off from the game, since their dialogues there is the first layer of canon. After that, I draw from the official adaptations (Hanamaru, musicals, Stageplay) for canon information. Because their personality mainly remain the same, despite different Citadels/situations.
Above anon already mentioned Recollections, so I also suggest you check out Internal Affairs as well. Mutsunokami have unique lines with the Shinsengumi swords in Sparring, which gives a look at how he view each member.
Outside of canon, just the typical historical research into their history and their masters. So that means looking up Ryoma Sakamoto for Mutsunokami and you can see how much he influenced his sword.