You wouldn't expect to Import Blender Classes into Unity. For Example: You can export a GameObject from Blender to Unity, but Blender doesn't have GameObjects. We need to extrapolate gameobject data ...

Learn how to export blend shapes from Blender to Unity easily and quickly. Follow this tutorial to create, export, import, and animate blend shapes.

Open Unity (Unity 5 is free to download) Create a new project and scene Go to the Assets Menu and select Import new asset. Select the .FBX Model you had exported from Blender.