On Simpsons tv series, id 456, there's only one. In his results a "gender" field is getting appended.

On Game of Thrones tv series, id 1399, there are 2. In their results gender field is missing.

Simpsons:

    {
      "id": 5741,
      "name": "Matt Groening",
      "gender": 0,
      "profile_path": "/zYzOuM94hbVmage9XZrQ8daHyoF.jpg"
    }

Game of Thrones:

    {
      "id": 9813,
      "name": "David Benioff",
      "profile_path": "/8CuuNIKMzMUL1NKOPv9AqEwM7og.jpg"
    },
    {
      "id": 228068,
      "name": "D. B. Weiss",
      "profile_path": "/caUAtilEe06OwOjoQY3B7BgpARi.jpg"
    }