Kage is a contract ninja. Rumors say that he will kill his own family if the right price was given. He has no loyalty to anyone, but if he is paid to do a job, he definitely gets it done. In that respect he has his own sense of ethics. He is highly competent as well, and many of his acts have affected history. For example, he was the one who brought the blueprints for the Burning Mirror to Pannu Yakuta when he was hired by the Scarlet Moon Empire, and on the other hand, he was hired by the Toran Liberation Army to deliver the blueprints for the Fire Spears to the Rebel Factory. [Additional information redacted]
He's from Suikoden, but also makes a brief appearance in Suikoden 2.
Georg is a travelling swordsman who has fought in more wars and parts of the world than most travelling swordsmen can dream of. He has made a name for himself as far north as the Grasslands, and as far south as Falena.
As a young soldier, his left eye was nearly put out due to carelessness on his part during a battle, only to be saved by his friend Ferid Egan. He then made a promise to help Ferid with whatever he needed. To remind himself of his mistake (and to not repeat it), he wore an eyepatch for many years over the same eye.
In the Scarlet Moon Empire, Georg was recruited to be one of Barbarossa Rugner's Six Great Generals, and served in the Succession War. Here he was known as 'Deathblow Georg' for his immense strength and skill in battle and was understood to be the greatest swordsman among the Six Generals.
Georg soon left the Scarlet Moon Empire, and, details unforthcoming, became the leader of the Ebony Moon Knights. This only lasted a short spell, however.
Georg travelled with Ferid to Falena, where he served as a Queen's Knight, and became good friends with the royal family. His true purpose there, however, was to do a favor for Ferid that he believed nobody else would be capable of doing. It was feared that Queen Arshtat could be completely taken over by the Sun Rune, and lose all connections to sanity. Georg's job in that case, would be to kill Arshtat and prevent the Sun Rune from destroying Falena.
He got the chance to live up to that promise in IS 449, when Arshtat was finally driven completely mad by the Sun Rune, and killed Ferid. Fulfilling his duty, he received his second one from the dying Arshtat - take care of her children. Georg does so, helping the Prince regain territory and going on various low-profile and reconaissance missions, hoping to officially distance himself from the Prince his cause wouldn't be tarnished by association with the man who murdered the Queen, but still help the Prince as much as possible.
As the war nears completion, he comes more to the forefront of battles, but fulfilling his duty, he left the country following the war. He travelled back to the Northern Continent. Eventually, near Tinto, he runs into Riou and serves under him in the Dunan Unification War, helping his cause with his swordsmanship honed over time, and the wisdom that can only be held by someone who has seen so many battles as he has, for the short remainder of the war. Following this war, he again travels off far away, not telling anybody where he is going.
He appears in Suikoden 2 as a minor character, but also is a major player in Suikoden 5 (Which actually happened prior to Suikoden 2).
Anyway, there are a few others, but I hope that helps some.