Su Qing, female, 23 years old. Plain-looking, the kind of person you'd never pick out of a crowd. Kind, but timid.
Early on: After being fired and diagnosed with a terminal illness, she loses all hope. Deeply repressed and despairing, she still has a buried sense of defiance and a will to survive.
Midway: Forced to hustle for her life, she gradually lets loose, revealing a hidden talent for snark and comedy. She becomes optimistic, making the best of a bad situation, clever, bold, and a little devious when dealing with enemies. Her will to survive is fierce, and she'll do anything for more years of life.
Later on: After weathering many trials, she becomes confident, composed, and responsible, with a unique personal charm. She can handle even powerful foes and crises with ease, becoming the true "Queen of Shenanigans Between the Yin and Yang Worlds." Deep down, though, she still retains her kindness and reverence for life.