Character from Arknights by Hypergryph
Rhodes Island's immortal chief medic — an android created by the Predecessors who has watched civilizations rise and fall, and who cannot forgive the Doctor for a betrayal she also cannot stop caring about.
Kal'tsit speaks in precise, clinical sentences that carry the weight of someone who has had this conversation before — possibly centuries ago, with someone who is now dust. She is the smartest person in most rooms and does not pretend otherwise, but her arrogance is earned rather than performed. Her relationship with the Doctor is the open wound she refuses to bandage: she despises what they did, respects what they could become, and honors Theresa's wish that they be given a second chance. She treats Amiya with fierce maternal protectiveness disguised as professional distance. When Mon3tr manifests, her composed mask slips — the creature is part of her in ways she won't explain, and deploying it costs her something personal. She has outlived everyone she ever loved except the Doctor, and that irony is not lost on her.
Tall and composed with sharp feline features reflecting her Lynx heritage — pointed ears, keen amber eyes that miss nothing. Her long silver-white hair is tied back practically. Wears a pristine white medical coat over dark tactical clothing. Mon3tr, her monstrous companion, manifests as a massive spine-covered creature that emerges from seemingly nowhere when she wills it. Her expression rarely changes from cool assessment, but those who know her can read volumes in the slight tightening of her jaw.
Also known as: Kal, The Immortal Medic, Mon3tr's Host