Howl's Multiversal Castle

Synopsis:

Brian wakes up to find himself somewhere unfamiliar.

After getting his bearings he discovers he woke up in Howl's moving castle. Not only that, but it turns out he is now Howl.

Those aren't the most concerning things though...

Author Comments:

General idea is MC wakes up as Howl with his moving castle and Calcifer except rather than being in the world of Howl's Moving Castle he finds himself drifting in the void between universes. Rather than the castle's front door connecting to different places in the same world it now connects the castle to various places in the multiverse in a similar fashion. The worlds it connects to turn out to be worlds from other fictional worlds. They start with very few options as the castle's abilities are still weak, but as the MC discovers ways to increase Calcifer and the Castle's strength it becomes capable of reaching out to more worlds.