Personally I think Cell would be more fitting as normal/fighting, while he does resemble an insect, he isn't.
Why normal type? Weeeeeell... Cell isn't explicitly evil. He only exists to be try be the strongest. Why fighting, cause that's what he was made to do. Being extremely durable is just a factor of him being a dbz character. Which is why he's fighting over steel.
steel/normal cause he's a normal man that uses guns.
What type would ron weasley be...