Flame-Kissed

As long as flame-kissed is attached to the character, at any point that character's STR is reduced to zero they are dead (unless it is caused by Threat from the North (PotS) - this is because this creates a "discard at 0" and a "kill at 0", since both are passives the First Player will decide which takes effect)

Just don't use Flame-kissed before trying to finish them off with The Hatchlings' Feast (ASitD). With that interaction, order does matter

Lets say that i played a flame- kissed on an opponents str 3 char that has cannot be killed, and then i play Threath from the North and my opponent is first player. can he say that the kill effect is the one that takes place and the discard one dosn't happen?

No, discard will happen regardless. When two conflicting effects happen simultaneously, such as in your example where the card would be both discarded and killed, the first playe decides which effect happens first. With conflicting moribund states this means that the first is the one to resolve since the second one can't change the card's moribund destination. However, if the character has 'cannot be killed,' then they cannot under any circumstances enter the moribund: dead state. So there is no conflict of moribund destinations and the character becomes moribund: discard.

Correct.  The only reason there is usually a conflict is because both effects are trying to make the character moribund at the same time.  In your scenario, only one of them can effect that character and so it is not conflicting and so it doesn't involve the FP to make any decisions.  

Ok cheers for the reply. I thought it was that way but wasnt sure

Could not find an answer to this question anywhere.

Let's assume player A attaches Flame Kissed to a Unique character with strength 1 and two extra "lives", copies of the card under it. 

Since this is an attachment and not an effect, does it mean that what happens is that the "flame kissed" effect would "burn" through all of the characters' lives and kill it?

The attachment stays attached until the attached character leaves play, or if its removed trough an effect. So if you save the attached card with an duplicate, it will still have the attachment and thus die again.

Thanks!

technically speaking, since removing the duplicate won't save the character as an end result, you aren't even allowed to attempt to save.  This is why it's considered a terminal effect.   If the save can't also remove the terminal effect, you can't trigger it.   You are correct that FK would essentially burn through the character, regardless of save potentials.  The only way to save from terminal burn is to save the character from death and either 1) remove the attachment at the exact same time or 2) increase their STR.  Risen from the Sea is a good example of an acceptable save from burn effects.  

Since Flame-kissed isn't a response ability, it is unlikely that Thinking will get you out of this.

Maybe 2deep meant He Calls it Thinking to block a Risen from the Sea?

Neither. I remember I once played a friend running Targ Burn. I had the Viper and the Viper alone in what was turning into a drawn out slog fest. Attacked with Viper who already had FK attached. Opponent triggers Meereen Tourney Grounds. He Calls it Burning. Attach to Viper, +2 STR with an attachment. Neutralise Flame Kissed. Feels good.

Hi folks,

Could you please clarify, if attached character still has -2 STR, even if he has not only "Flame-Kissed" attachment, but one more?

When Flame-Kissed says, "If attached character has no other attachments...," it is indicating a second attachment of any type -- even another copy of Flame-Kissed -- will "turn off" Flame-Kissed's effect.

Or, said another way, if there is more than 1 attachment total on the character, Flame-Kissed does nothing.