What is your favorite Stage 4 Fight?
This can include various fangames as well as specific fights like which form of Satori in Subterranean Animism or Yuki, Mai, or Yuki and Mai together in Mystic Square.
My favorite is Yuki Solo (The Red one) from Mystic Square, seconded by Aya Shameimaru.
Special Mentions are the Yakumo Trio from Concealed the Conclusion, both of the IN Stage 4 fights, and Seiga NyanNyan.