About a Humanoid Gundam Who Traveled to the Collapsing World

It's my first time writing a book, and I am a member of the Beng San + Genshin Impact + Gundam Party, so the book will also cover these things. Also, I'm not very good at writing protagonists who are very talkative, because my own personality is that I rarely talk but talk a lot on the inside (that's me being sultry). So my protagonist will also be a character who doesn't talk much but has a lot of inner drama.