so is the whole suit one piece of fireproof material?
or is it separated in different pieces for the joints?
also have you thought about adding a oxygen tank to breathe through the smoke and underwater?
does the hook even work in the water?
it could probably go better if you add those little fans on different parts of the suit to be able to work underwater, it looks heavy and it could help to fix any part of the submarine.
you could also add a tank of liquid nitrogen to figh ms. pyromaniac.
I honestly have many more but I think would be enough.