I will say that Challenges that have effects that transform characters into other forms will be optional rather than mandatory, and that if people don't want to change their characters into something else, they can choose not to. It's just a bit hard for some players to have their characters change and have to adapt to things they're not prepared for. On the other hand, people that want to change to fit the theme of a Challenge or adapt to certain situations and/or environments are encouraged to do so.

[@Azakma] Oh right, Super Skrull's accepted. Sorry for forgetting until now.