Hehe, well maybe, but he's still harsh as he proves he doesn't care for his team mates, but only himself (kinda like Sasuke, and Suigetsu and Jugo) and even doing things on his own (If you remember from 12, Madara and Kabuto has no idea where he isxdHe is definitely not cold-blooded killer. He was going to kill sonia because she knew to much. That was bare necessity. Make a girl character that will fall in love with him. Once they get really close, make him kill her in order to wound/kill kakashi or someone else. Make him kill her because she was trying to stop him in one of his evil doings. Make him kill someone who is at least little bit important to him... He is not cold-blooded enough
And about that "screwed" personality. Sasuke has "screwed" personality in original manga. Is he not retarded due to it? Cold-blooded killer: yes. Cares for none: yes. Revenge is center of his life: yes. Making retarded moves, saying totally retarded sentences: yes. Everybody knows you never go full retard and look what have happened with sasuke and what is happening with akashi. You can have "screwed" personality and be cool.
Under "improving" I didn't meant for you to improve his battle power. Improve his personality.
How am I going full retard with Akashi?xd The poor guy has been taken away and brainwashed with all kinds of drugs and trash by Kabuto
Well how do you improve people who has done bad things?
So I will make you feel satisfied with the next chapter, or else you simply don't like his character like many don't like Sasuke