I must do a part two for Sariel because s/he is awesome.

1. All other versions of Sariel are male, and the sprite could be intended to be of either gender. The only reason to assume that this Sariel is female is that the Touhou games quickly turned into an all-female cast.

2. Her second phase is a silhouette of herself, and has much less health than her first phase.

3. Sometimes depicted with her eyes always closed in fanart, though it's difficult to tell as Sariel only has one static sprite.

4. Because she resides in a world of demons, and because the Sariel she is based on is recorded in some writings as a fallen angel, she is widely regarded as being one herself.

5. The grim reaper of the Azrael variety.

6. Sariel has a circle of magic around her.

7. "Let's Die All Together", her second theme, was later renamed Civilization of Magic.

8. Her first form is a seraph-like due of her six wings and has a weird shard on her chest which is her weak spot.

9. Her second form is a silhouette, similar to the final bosses/extra bosses cover art of the Windows game's jewel cases.

10. The original title of her second leitmotif, Death Will Take You With Me (or Lets All Die Together), indicates that this is what she was trying to do when Reimu defeated her.