Tira

First introduced in Soul Calibur III, Tira is a girl who was damaged during the Soul Edge seeding and became a servent of Soul Edge. She works like an assassin and can control a flock of birds. She plays a part in multiple characters story always appearing and collecting fragments of Soul Edge. In Soul Calibur IV she has developed schizophrenia and has two personalities. One is happy and takes a lighthearted approach to her job of killing people, but when she feels physical pain the dark personality takes over and she becomes angry and bitter and masochistic. The split personality has an effect on her moves and you can command Tira to inflict pain on her self to pull out her other half which is more powerful but some moves hurt herself.