In Attack on Titan, I heard 死にたくない人 mean "People who don't want to die", but I'm curious how can we make this into "People I want to die" or "People I don't want to die". I'm currently thinking something like:
死んでほしい人 but I think that means "People that want someone else to die"。 Maybe it's 俺が死んでほしい人, but is there a better way to say this?
死んでほしい人 is just fine. It is understood as meaning a person or people you wish dead unless context suggests a different interpretation. You can also say 俺が死んでほしい人 if you need to make it clear you are the one wishing, of course.
The same phrase (without 俺が, of course) could mean a person or people who wish someone else dead, but who that someone is needs to be clear from context in that case. If not, this interpretation is unlikely. Besides, if the one wishing is a third person, you would more likely say （〜に）死んでほしがっている人.
