Unity Humanoid → FBX Animation Exporter by Byte Bard

Better Fbx Importer & Exporter

02：FBX Exporterのインストールと準備

New FBX Exporter in 2017.2

Here is how to export FBX models to Unity with perfect transform rotation values if you're suing Blender. Works perfectly with rigged meshes too. More details is in the comments.

Getting Started Guide to Unity Animation and Animator - VionixStudio

Animating and Working In Unity

Unity 2Dアクションの作り方【アニメーション作成】