Ageha

Ageha is a mysterious lifeform found one day crawling outside your house, though initially she seems quite monstrous and unintelligent, she later evolves a body closer to that of a human and an intelligence to match. In the visual novel her appears like a abomination withouth legs, sharp teeths and two eyes in the right eye section of her face but when the history continues and she spend time with the protagonist she "evolve" into a girl with two extra arms, multiple eyes in her right eye section but with a bandages covering it and the right arm is only a tentacle with other small tentacles.