Is angst allowed? And if so may I request a headcanon on how of the any of the CĂș might react to overhearing their Master say in a conversation with someone that if by chance any of the CĂș killed them whether by accident or not that their Master would tell them it's okay, forgive him and die smiling? I had of Lancer, Caster, Proto or CĂș Alter in mind when I was thinking about this but feel free to choose however many of the 4 you feel like writing for.
CĂș Chulainn (Alter, Caster, Lancer, Prototype) Being Forgiven If They (theoretically) Killed Their Master:
CĂș Alter
Unlike the other variations of CĂș Chulainn, this version of Ireland's Child of Light doesn't have much of a reaction when he hears that you would forgive him if he killed you. Though to be fair, he doesn't have much of a reaction towards most things. CĂș Alter is an inversion of the regular CĂș Chulainn. This version of CĂș finds no meaning in anything other than victory. Because of that, he feels indifferent towards many things, and that largely includes you too.
Perhaps due to his Berserker mentality and class, Alter has a very clear way of viewing & understanding situations. To him, he has been summoned as your servant. Therefore, since you are his ally, he will not kill you. So long as you do not betray him, his lance will never be pointed at you (Bond 4). If Alter did kill you, then you were/you became his enemy, and therefore he preformed his duty as both a warrior & as a king and killed you. Simple as that.
At higher bond levels or ascensions, Alter might be slightly displeased by what you had said, but wouldn't dwell on it too long or bring it up unless it affected his ability to complete the mission.
CĂș Caster
CĂș Caster probably wouldn't be very happy to hear this line of thinking from you. That being said, of the various CĂșs recorded in the Throne of Heroes, his manifestation as a Caster has resulting in him being the calmest of the all CĂșs in Chaldea (April Fools). Because of that, he won't suddenly jump out at you right then and there and start reprimanding you for what you had just said.
But get ready to have a talking to in private. There's no avoiding it or putting it off. Caster he may be, but he's still the same stubborn dog as always so don't think you can escape from this. Will probably have a very long chat about why you think like this. Him killing you by accident is one thing, but you forgiving him for deliberately killing you is another. He isn't mad or disappointed, but is genuinely concerned since he does care about you.
CĂș Lancer
Hearing you say that you would forgive him for killing you, whether it be on purpose or by accident, pisses him off quite a bit since it hits a little too close to home. He already has to deal with ScĂĄthach desire for death by his hand, so he'd rather not have to think about killing you too.
In life there were a lot of people who he failed to keep his promises to. His mentor, a princess, the goddess of death, and the queen of an enemy nation (Bond 4). He hopes to be a little bit more dependable this time around and would prefer to not have to add you to the list he has let down already.
Since he has a tendency to get caught up in the moment, he'd probably interrupt your conversation with that other person and let you know right there that he heard what you said. CĂș when truly pissed isn't the type to get loud and yell; he gets harsh with a cold look on his face. He'll say some pretty mean things before leaving in a huff to go hit something (probably Archer). He'll forgive you eventually, it will be a while before he stops giving you some attitude.
CĂș Prototype
CĂș Prototype's reaction is about same as his older variant, though with perhaps a bit more emotion when he confronts you. Being younger and having less life experience, combined with his greater enthusiasm, means that there's probably going to be a lot more yelling. Being the loyal pup that he is, the thought of killing you even by accident is abhorrent to him. He'll declare right there that he'd rather kill himself first before he'd let himself kill you.
