a samurai is a person of independance and strength, who is able to stand alone, and only participates in collective endeavors for purposes of their own, rather than any feeling of compulsion. They don't feel pressured by society.
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.
"-Get so-and-so to come out tonight and do this or that.
-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."