orkdestroyer1 wrote:no you cant use him in a blood angels army because he is a unique character but in my blood angels army i have a master of the forge because he is a) better than a techmarine b) he is not an unique character
It makes no difference whether it's a unique character or not. The rules don't allow you to take choices from multiple codexes. And if you're doing so solely because another codex has something that is a better option than what you have in your codex, you're somewhat missing the point of having different armies in the game in the first place.