Who would you add/delete to improve Fantastic Four?

This is not an easy question for me to answer. However, I believe that looking at the success of the Avengers and the X-Men, it is time for the Fantastic Four to probably add at least one member, if not two. Others might want to keep the team at four, but exchange a member of two. I vote to add Crystal as a fifth member and keep the original four.

If anyone was taken out of the Fantastic Four, it would definitely NOT be an improvement. Hickman's killing of the Human Torch was an exception. Basically, all the characters serve a really important rule, which is part of what makes the team so great. Adding Crystal or a similarly-powered character wouldn't bother me, though. As long as the character wasn't too powerful as to dwarf the other characters, it wouldn't be necessarily a bad thing at all. Crystal is definitely a good choice, though. Seeing her in an FF costume would definitely not look out of place.

Can't anyone away, but another character might give it a bit more flavor. I liked it when Spidey was on the team. Although he fit in almost too well, not sure if that works, or someone who caused a bit of friction would be better