Coppélia

Question : If my opponent controls a card such as Robin Hood that affects the cost of Characters when Coppélia is supposed to be played "for free", will I need to pay mana?

Answer : Coppelia is played for free! Playing a card for free means bypassing its cost entirely, which is different from reducing it to zero.

Question : Does Coppelia gain Fleeting when played for free via her effect?

Answer : Yes, unless something else prevents it, a card played for free follows the other rules, such as becoming Fleeting when played from Reserve.

Question : If Coppelia is played for free thanks to a Quick Action, such as the power of Treyst & Rossum, does it end the turn?

Answer : No. If the resolution of Quick Action includes playing a card, the turn continues normally.