Okay here is something I need to cover.
Two gems can combine to make a giant woman, unless one male and one is female, then its just gender neutral, and if two men combine it becomes a giant man.
So if you want to do combining with someone, then find another gem you two would like to represent when you become one. I can further explain if you don't get it. Just put Combined Gem Form
At the end of your CS if you have made a combination with another character.