Samurai Deeper Kyo

Demon Eyes Kyo (Nobunaga):
Complete Story mode as Kyoshiro Mibu to unlock Demon Eyes Kyo in Versus mode.

Ieyasu Tokugawa:
Complete Story mode as Benitora or Yukimura Sanada to unlock Ieyasu Tokugawa in Versus mode.

Migeira:
Play through story mode as Shiina Yuya. When you reach to Onimei No Kyou, he will be there with Migeira (as an Assist). Defeat Onimei, and Migeira will say something about justice and he will become unlocked. Note: You may have to complete Story mode with other characters related to Migeira (Yuya, Yukimura, Onimei no Kyou, Kyoushiro, Benitora, Sasuke and Mahiro).
Information in this section was contributed by Louie.

Oda Nobunaga:
Complete Story mode as Hontenmaru or Sasuke Sarutobi to unlock Oda Nobunaga in Versus mode.