ChäoS;HEAd, Persona 4 the Animation Recommendations
There exists a personification of your innermost feelings and thought processes. In Chaos Head it exists as a "delusion", something brought into reality, while in Persona 4 it exists as a "persona". If you aren't careful, you can be killed.
Both have another world-kind of feeling and they have plot and characters that resemble each other. I think they are really related why? Because they both origin from japanese role-playing video game.
Similar plot, starts with murder, then the murdering is stopped and the main characters have to find out more like why or how. There is like a fantasy world and the real world and they are mixed together in a really great and original way, I really love both anime
In both these series, the true potential of the protagonist are kept a secret. They eventually come to realize how strong and powerful they are.
Also, there are random series of murder which start making sense towards the end.
Both anime contain viable amounts of mystery and action and are worth watching!
Both series features strange phenomenon that happens over a city that is shrouded by mystery.
Both series contains elements of both supernatural and science fiction themes featuring some action later on as well.
Both series' main protagonist has "delusions" that are occur in various episodes.
Both series also include plots featuring a murder that has many questions that needs answers.