SoRCon 11 23-25 Feb 2018 Basildon UK http://www.sorcon.co.uk
If I have HHH active and opponent has active Ember (You may not play character cards that do not have special power text) (deactivated by HHH): can in you turn play a card without special power text, cover HHH making it inactive and opponent Ember active which would than not allow you to play this character?
This one is easy if you think it through. First you play your new character. Only after it is successfully played is HHH covered. So during your play, HHH is uncovered, hence it is active, hence Ember's text is ignored, hence nothing to stop you playing the card.
While the justifying quotes from the rulebook would need changing, a massive job I'm not planning, take a look at the Blue Moon FAQ list. The exact line of argument may have changed (but may not) bit the answers are all unchanged.