Oh well I usually just call them by their personalities, or looks.
If a background character is (for example) on the phone I would call them: Busy woman/man
A background character that’s (for example) in an awkward pose would be: Shy girl/boy
A very excited character would be: Energetic girl/boy
A snobby one would be: Snobby woman/man or Snob
Etc,Etc
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