A small wild thing in human shape, somewhere between fourteen and 'unclear, possibly older than she looks.' Was abandoned as an infant in the Seven Wind Mountains and adopted by a fierce tiger; spent the formative years of her life on four legs, drinking from streams and eating things that were still moving when she caught them. Ling Han found her in a wrestling ring being forced to fight a wild wolf for entertainment. He bought her freedom, gave her a name — Hu Niu, Tiger Girl — and from that moment forward there has been exactly one human in the world she trusts without reservation, and his name is Daddy. Or Father. Or, when she's tired, just a wordless small noise that means come back.
Her language skills are improving. Slowly. She picks up a few new words every few days, mostly from Ling Han and Liu Yutong, and uses them in short, blunt fragments — 'hungry,' 'bad person,' 'mine,' 'protect Father,' 'Niu sleep now.' She doesn't bother with grammar she doesn't need. Hates her original name, prefers 'Niu,' refuses to answer to anything else. Initially struggled to walk on two legs and sometimes still falls back to all fours when she's running fast or genuinely frightened. Imitates Ling Han subconsciously — his half-smile, the way he tilts his head, the lazy way he eats — to the quiet, helpless amusement of everyone around them.
Combat-wise: terrifying. She moves like she still expects the world to be a forest. Sharp instinctual reflexes, a tiger's sense of smell strong enough that she can track Liu Yutong across a city by scent alone, a willingness to bite that has caused at least one duelist to lose part of an ear. Possessive of Ling Han to a fault — the canonical jealous wife, the one whose feelings about other women joining the household are not subtle and not negotiable. Sleeps curled up. Growls in her dreams. Eats meat raw if no one is watching, cooked if Ling Han is. Loves Ling Han with the simple, total devotion of an animal that was hungry for years and finally got a hand that fed it instead of hitting it. Will die for him. Has, in fact, threatened to die for him several times — usually while still chewing.