Mia Karnstein is a prominent character in the action role-playing game Code Vein. She is a Revenant, a vampire-like being who fights to survive in a post-apocalyptic world. Driven by her fierce protective instincts, Mia is devoted to safeguarding her younger brother, Nicola. Her unwavering determination is matched by her skills with a bayonet, which she wields with precision. Despite her often cold demeanor, Mia is compassionate and cares deeply for those she considers friends. Her journey intertwines with other protagonists as they navigate the world's dangers together.