Amazing illustrations drawn with a ball point pen by Shohei Otomo. A modern day artist who is also the son of Katsuhiro Otomo who Created & Directed the classic anime film, "Akira."
"Ronin" - a term that has acquired an almost cult status in pop culture simply refers to a samurai who is no longer retained by a lord. They are depicted in pop culture as loners, be it good or evil, when in truth it was quite common for many Ronin to band together as hired mercenaries. The most famous of Ronin is arguably Miyamoto Musashi (1584-1645) who's prowess in battle saw him lend his swords to many wars.
Samurai about to commit seppuku - ritual suicide by self-disembowelment. There is usually a "second" close at hand, armed with a katana, and he will strike the head from the body of the suicide, as the death would be slow and agonizing. It's an "honor" thing...