maester tower and Kindly Man or Fiery Kiss. if I copy the effect,it will copy the whole effect,right? so the 2 chars return to play will be discarded both?

Yes, the whole effect will be copied. Note that you can copy the Kindly Man's effect only if you take a character from your dead or discard pile, but that the copy can still take a character from any player's dead or discard pile.