A shrine maiden who can communicate with dragons. After coming of age, Kokoro left her sheltered life and decided to involve herself in society by debuting as a Liver.
Kokoro made her YouTube debut on 13 August 2019.
On 24 February, Kokoro debuted her second 2D costume.
On 28 May, Kokoro debuter her 3D model.
- "Posanke" 「ポ三家」 - Kokoro, Ratna Petit, and Eli Conifer. (The three are debut mates.)
- "Ji no ni" (J-2) - Kokoro, Hakase Fuyuki, Kagami Hayato, Yorumi Rena, Mayuzumi Kai, Ars Almal, Aiba Uiha, Eli Conifer and Ratna Petit.
- "Allexceed Familia" (AXF) - Kokoro, Kuzuha, Ratna Petit, Fuwa Minato, Saegusa Akina, Ars Almal, Sakura Ritsuki, and Luis Cammy.
- Color: #C5EDFF 
- Kokoro's voice has been noted to resemble fellow NIJISANJI member Ars Almal, so she can imitate her well.
- Kokoro shares the same character designer with Sakura Nodoka of KasoCombo and Kurumizawa Momo of NoriPro.
- 天宮 こころ / Kokoro Amamiya 【にじさんじ所属】 - YouTube channel
- あまみやこころ / Amamiya Kokoro - NIJISANJI corporate profile
- Kokoro's corporate profile on the official NIJISANJI website
- @amamiya_kokoro - Twitter account
- @amamiya_kokoro - Marshmallow account
- 天宫心的新人搬运 - bilibili account
- #天宮こころ - General
- #こころらいぶ - Stream talk
- #絵こころ - Fan art
- #下こころ - Fan art (NSFW)
- #サムネみゃ - Thumbnail submissions
- #あまみゃボイス - Commentary on released voice dramas
- #あまみゃの切り抜き - Video clips
- 天宮こころ - JP NIJISANJI Wiki
- 天宮こころ - Nicovideo Encyclopedia
- 天宮こころ - Pixiv Encylopedia
- 天宫心 - Moegirl Encylopedia