An organization's culture is the sum total of the characters of the individuals in the organization. The addition of any single individual impacts the culture and the culture impacts the character of anyone joining it. This is why it's so important to get at the "fit" question in interviews and manage the assimilation part of onboarding well.
Recall the B.R.A.V.E. framework described in an earlier post:
Behavior
Relationships
Attitudes
Values
Environment
In terms of character, these are about how individuals:
Behave: act, make choices
Relate: communicate with others, engage in intellectual debate, manage conflict
Attitude: feel about and identify with family, tribe, society
Values: underlying beliefs, principles, approach to learning, risk, time horizons, etc.
Environment: with what and whom they choose surround themselves
I'm making this up along the way here. Would welcome input from others that know more.