Samurais were usually warriors mounted on horses and dueling each others with bows. During the history, samurai devoted their life and their honesty towards the Daimyos, great warlords. Samurais ended up adopting the sword, usually called Katana, rather than the arc. Samurais were following the bushido, the way of the warrior, their code of honor.
They must also be quite skilled and capable relative to the general population.
As well as observant, alert, individualistic, authoritative, mysterious, clever, capable of both courage and stealth, of both bluntness and finesse.
The aesthetic is important, and the samurai's general lifestyle, manner, and dress, must all be quite artful, elegant, and graceful.
Between the samurai and other elite individuals that the samurai has come into contact with/dealt with, there will be quickly struck and intense forms of both loyalties/alliances and enmities/personal wars. These relationships are complex and intricate and can shift dramatically at any time, although they can also be extremely longstanding.
-No, I can't change their mind, they're a samurai. They'll only come/do this or that if they decide to on their own. Or if their friend such-and-such tells them to."