The following information comes from Senran Kagura producer, Kenichiro Takaki...

“One thing I question in games is that even though people will play in different ways, the characters develop in the same way. You would think that someone who only fights with an axe would grow huge arms, and their battle cry and the amount of muscle they carry would change.”

- the character fighting style changes are showing by Yin and Yang styles that are represented in combat

“The idea is based on Sadism and Masochism. If your character cleanly lands multi-hit combos, her Yang (S) style will strengthen over time and her voice will come to sound more aggressive to show this. Yin (M) style is also very aggressive, but by pulling off certain moves, the character will strip down to her swimsuit. She will forego defense entirely and bet everything on swiftly raining blows on the enemy. She will be taking much more damage and the pain that comes with it, but her attack power will greatly increase and she’ll be able to string combos together endlessly. She will become more sensitive to pain, and her voice will take on a certain arousing quality. Yin style fighting is very satisfying.”

- Yin and Yang attributes are shown via an in-game gauge
- max out both meters to gain a third attribute
- you can then switch between all three at this time