The system user should be used to login to the app and security config. Process related data, i.e. the name of someone as used in the process, should not be the account/user data. Thus a separated entity Person/Employee/[FillInYourProcessNameForYourApp] with a 1-1 association to Account.
Answering your question; showing the Owner of an record;
- Using the Owner -> for security restrictions and processes in Microflows
- Displaying