Anime Pulse

If you could make a spin-off of any anime, what would it be? Go into as much detail as you feel.

My pick would be Deadman Wonderland. But it would be a prequel with the protagonist mother as the main character where you get to see her discover the origins of where the deadman virus came from and how she would develop it into what it would become. Or we could get what life was like inside the prison before the protagonist shows up.

I guess a spinoff would not include a simple continuation of a given series, as there are a lot of those I'd nominate. Rather, a spinoff would be a side story or character to a given work.
In that case, I would like to see a new spinoff of Cowboy Bebop -- with the ending we got for the original series, perhaps we could see the continuing adventures of Ed and Ein.
I'd also like to know more about the world of Last Exile, and NOT the one we got with Fam the Silver Wing.
And if I had to pick another spinoff, I would love to see a a spinoff of Chika from Kaguya-sama: Love is War
I mean, she steals the show anyway, so she might as well get her own show, or (even better) an OVA.