"никем" meaning in Russian

{
  "forms": [
    {
      "form": "нике́м",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "nikém",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "pronoun form",
        "head": "нике́м"
      },
      "expansion": "нике́м • (nikém)",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "pron",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Russian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "niktó, “nobody, no one”",
          "word": "никто́"
        }
      ],
      "glosses": [
        "instrumental singular of никто́ (niktó, “nobody, no one”)"
      ],
      "id": "en-никем-ru-pron-iWEWxIwT",
      "links": [
        [
          "никто́",
          "никто#Russian"
        ],
        [
          "nobody",
          "nobody"
        ],
        [
          "no one",
          "no one"
        ]
      ],
      "tags": [
        "form-of",
        "instrumental",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[nʲɪˈkʲem]"
    }
  ],
  "word": "никем"
}

{
  "forms": [
    {
      "form": "нике́м",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "nikém",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "pronoun form",
        "head": "нике́м"
      },
      "expansion": "нике́м • (nikém)",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "pron",
  "senses": [
    {
      "categories": [
        "Russian 2-syllable words",
        "Russian entries with incorrect language header",
        "Russian non-lemma forms",
        "Russian pronoun forms",
        "Russian terms with IPA pronunciation"
      ],
      "form_of": [
        {
          "extra": "niktó, “nobody, no one”",
          "word": "никто́"
        }
      ],
      "glosses": [
        "instrumental singular of никто́ (niktó, “nobody, no one”)"
      ],
      "links": [
        [
          "никто́",
          "никто#Russian"
        ],
        [
          "nobody",
          "nobody"
        ],
        [
          "no one",
          "no one"
        ]
      ],
      "tags": [
        "form-of",
        "instrumental",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[nʲɪˈkʲem]"
    }
  ],
  "word": "никем"
}