Deep Shadow (真影 - Shinei, lit. "Portait") is one of Asuka's reoccurring Ninja Arts and it appears throughout the Senran Kagura series.
Deep Shadow is very different between both the 3DS main series and the VERSUS sub-series:
- 3DS Main Series: In the 3DS Main Series, Deep Shadow Asuka is a separate playable character with her own unique move-set.
- VERSUS Sub-Series: Deep Shadow is a Ninja Art that allows Asuka to turn into Deep Shadow Asuka with an altered moveset, instead of being a separate character in the 3DS main series.
Asuka's Ultimate Secret Ninja Art: Requires 5 ninja art scrolls to use.