Hello again, thanks to those of you who helped me in my earlier thread, it was really helpful. Just needed to clarify a few more things.
1. Can the player going first do a challenge on his first turn?
2. Can you choose to just discard friends to make room for new ones? or do they have to participate in a battle or be replaced by a character of the same name?
3. do Heartless in dark decks suffer from uniquness rule in the friend area?
4. King Triton lets you play him as a LV1 friend and then counts as a LV2 friend for bringing in new friends, so why did they re-release him as an uncommon in set 4? (this is more about curiosity I guess)