Would you kill Loki if you had to?
[Okay, I found this in the depths of my ask box and I wanted to answer.
Going to answer it as Mun, because this question would make the muse too evasive.
Yes, he would. That's the simple story. If it was necessary, if he had no other choice, he would do it. Because he's driven by the understanding that he is and always has been a last resort. A last line of defence.
He would try everything else first though. If there was a single way he could persuade her, bribe her, threaten her - he would.
There are also very few people he would kill her to protect. Loki becomes more important to him with each passing day, and that means that he's ever more conflicted. He knows she's not innocent and more than capable of protecting herself, but he wants to keep her safe if he can.
Tony has a serious saviour-complex, incase anyone wasn't aware of the fact.
His feelings for Loki are so unbearably complex that it makes this difficult to answer - although as you've seen, my instinct as at the top.
He's falling for her. Badly. Irrevocably in fact. The danger here, unexplored by me as of now, is that he's never allowed himself what she has. To allow the darkest side of his nature to be exposed to the light. The darkest Tony the movie audience have seen is not more than a glimpse of what he could be.
So yes, he would kill Loki to save the world, or to save his own life. That's... yeah. There is very little else, and even fewer people, he would do it for. He's crazy about her, and it's always skewed his judgement.]