Stunts performers have their own section. They’re not added to the Cast section. 

Stunts

• The stunt list includes stunt performers, stunt coordinators, and related job titles.
• Photo doubles and stand-ins do not belong to the stunts list. They should be submitted as part of the additional crew list.
• For stunt double work, we only allow credited roles, unless further details of the role are supplied.

Examples:

stunt double: John Mauser 

  stunt double: Policeman

• Please submit the uncredited attribute for any stunt work that was not credited on screen. Failure to do so may result in the entry being subsequently removed.

Often, stunt people will appear in cast with a character name.

Can you clarify this? Sure, probably sometimes the ”stunt people” could have an additional role in the film, but stunts are usually stunts.