I really haven't thought about killing off my characters or how they would go. Yet I can easily see Kalinda either dying as she loses control of her powers, or by suicide too-emotions are powerful things.

Connor and Phoebe...I can't picture them dying...maybe in a fight?

I love all my characters and the one time I've ever killed some was in a roleplay I had going for two years and literally the only way to finish it off satisfactorily was everyone dying. It was a very emotion scene, and still one of the greatest roleplays I've ever been in. 

I have ideas for my characters but no way to plan them out...