ok, I'm looking at foom's rules, and it says he ignores opposing charachters mastermind, support, several other things but these two have me confused....

does that mean you cannot mastermind the damage dealt by foom?

and what does ignores opposing support mean?

It means you can't give away the damage Foom deals.
When he hits you, he hits you.
Keep in mind, the guy is massive. His fist is far bigger then most people. Its not something a thug can jump in the way of an stop Penguin from being hit.

And he can't be supported. It means you can't heal Foom with someone else.
Opposing figs can of course still Support each other.