Nanagi will kill if she thinks it's for the right thing. If she truly believes that in the end, she is helping someone and protecting someone by killing another person, then she'll try do it Stroud. Valen. Will she maybe feel the regret later? Sure! But there wont be as much regret if she were to kill someone because she was manipulated into thinking that they were the "bad guy".
Kanako will use what resources she has and try to avoid killing if possible. The resources she uses can either be bribery, sweet talk, or letting someone try to stop X person she might have to kill. If it gets to a point where she is all out of options and she can't just talk her way out of it, then she'll do it. She'll do it in a heartbeat and ask questions later. The exception being if she thinks X person will give her some sort of leverage down the road or answers.
Kanako will use what resources she has and try to avoid killing if possible. The resources she uses can either be bribery, sweet talk, or letting someone try to stop X person she might have to kill. If it gets to a point where she is all out of options and she can't just talk her way out of it, then she'll do it. She'll do it in a heartbeat and ask questions later. The exception being if she thinks X person will give her some sort of leverage down the road or answers.