Nobody can remain clean-handed forever with certain things they do. It's a profession to drown yourself in.
It would be really easy to just say he's an "assassin", but that may or may not be a metaphorical description.
In the past he would have been blood-lustful by going balling nuts with knives and having mindless psychotic episode, but I believe there are far more grotesque and disturbing ways humans can be without blatant violence and try-hard "evil" images of oneself. It takes beyond impulsive killing-spree or showcasing of dangerous equipment to be really more than just a repetitive "psycho".
That gets boring, because these types of characters never deal with consequences. In fact, they are pretty much done when they face it, for they were never designed to never face it for the sake of their superficial images. All they end up being is a show of blood, knives, superficial principals and drama. Afterwards they become pathetic and rather petty.
So enough of this blatant blood fest. I want to develop my characters, not with the pools of blood that they've brought, but with them drowning in it. They are no longer superficial beings with the ability to make them somehow disappear. They are beings with humane difficulties in having to decide between breathing under and drinking what they've brought upon themselves, or else succumbing to inevitable defeat. They are beings who chose to take an extreme path of life and for that they must pay a certain price. And what drives and makes them succeed at surviving on this path is what would define them.
This is probably just basics of developing decent character. I just felt like writing a long thing, haha, and maybe to give myself a simpler focus. I also want to change his image for good. He was a petty mess when I first created him, but I suppose that's a common development process.
Started out just drawing a bowl on his head. For the type of drawing this is in, it took long. Wasted first few hours trying to decide on the pose.
Artwork & Character (Kai) © Emptyshadow (me)