The Unicorn Of RWBY (Male!Child!Reader X Yandere Unicorn Gundam X RWBY)
An AI known as Yumi inhabits the Gundam Unicorn suddenly gets the desire to have a child witch is you, and she'll do anything to protect you even if that means hijacking a Star Cruiser or going to Remnant to destroy a certain Grimm Queen. All Giant robots, Spaceships, Evil Grimm Queens, and other Cosmic creatures...