the.com/supporting cast

The people who make the lead look good and never get the credit.

means The secondary characters and actors whose roles exist to serve and strengthen the story built around the main character.

from From theater and film production terminology, where actors were literally billed and credited by rank — 'leading' roles versus those cast 'in support.' The phrase moved into everyday English by the mid-1900s as a ready-made metaphor for anyone who props up someone else's starring moment in real life.

origin
theater term for secondary billing below the stars
irony
often does more narrative heavy lifting than leads
real life use
friends, mentors, exes who shaped you offscreen
oscar category
literally has its own award for this reason
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