If you liked the Chaos;HEAd anime, the Anime-Planet community thinks you'd like:
In the streets of Tokyo, a new menace has surfaced: Shounen Bat, a young boy who wears golden roller skates and a baseball cap, and likes to whack people on the head with a golden baseball bat. These seemingly unconnected and random attacks soon become a police investigation... but after all is said and done, is there a pattern to this chaos?
Two shows with a mix of humor, the bizzarre, and the surreal that revolve around strange crime sprees.
To be honest, both series both have the premise of something ordinary to start of with...but eventually end up somewhere completely different from where you expected. The psycological aspect of both shows is rather interesting and will probably appeal to both audiences.
Both Paranoia Agent and Chaos;Head are thrillers with a seemingly untouchable villain with unknown motives or origin. Both shows are all about uncovering the thruth behind this person, before much more harm is done. If you liked this in one of these shows, you'll enjoy the other as well.
Morimiya Yorito is a normal student who has an abnormal obsession for the sky. One day, he meets a strange girl named Shihou Matsuri who shares his interest, but as fate may have it, she isn't a human; Matsuri is a Yaka -- a "woe of the night" -- who is immortal and cannot stand the sunlight. A strange man is chasing Matsuri, to use her powers, so Yorito decides to help her hide. What are the strange man's plans, and what secrets does Yorito's sister hide?
Sola is more on the romantic side while Chaos Head is more psycholigical. They both have the same feel because of their main character. Chaos Head starts of differently compared sola but as you reach the end you'll see the similarity between them. Really enjoyable series and highly recommended.
Although the series themselves aren't especially alike in terms of story, their is still a large amount of action in both.
The main connection is between two of the main characters having a near identical past. Saying too much would spoil both of them but when you got to the twist of either and enjoyed it you'll like the other series too.
They both also have one male character in each and a swarm of girls he barely notices. If you like that kind of thing. :P
Chaos;Head and Sola both have characters with similar style pasts. The action type is the same in each too.
Strange things have been happening at a local high school... mysterious disappearances, strange powers and brutal murders all emerge amongst kids who, up till now, have been perfectly normal. Even the Shinigami (Angel of Death) herself has been sighted. What's happening? The answers lie in the mysterious creature known as Boogiepop...
Aside from the fact that Boogiepop Phantom is much more a cult-series than Chaos;Head, and the latter is definitely easier to digest, Chaos;Head and Boogiepop share their feeling of creepiness and thriller-like mystery surrounding a certain "untouchable person". If anything, Chaos;Head is like Boogiepop, but made accessible for a larger audience. Fans of either that are looking for something similar, but different on the heaviness, give this one a try.
Both dark shows with a large cast and the viewer is not entirely sure if everyone is crazy or there is a hidden conspiracy.
In 2010, the Britannian Empire enslaved Japan using powerful mecha known as Knightmares; in the aftermath Japan was renamed Area 11, and its people began a hard and terrible existence. Lelouch, a Britannian student living in Area 11, has grown up hating the Empire and everything it stands for. One day, in the middle of a terrorist attack, Lelouch meets a mysterious girl who grants him the ability to control minds. Can he use his new power to fight for freedom, or will his hatred twist his good intentions into mindless acts of vengeance?
After a series of unfortunate events, the young Hirose Takuma was rendered blind. In an attempt to reverse his condition Hirose moves in with his uncle in a rural village, and upon his arrival he quickly begins to make new friends. However, Hirose soon discovers that one of his classmates, Hayami Kohinata, is being harshly bullied by her peers for reasons that neither she nor anyone else wants to explain. Even the seemingly honest and gentle Hinata Kagura, who had been doing her best to be friendly and helpful to Hirose since his arrival, acts harshly towards Hayami. Once a mysterious girl bequeaths Hirose with a life-changing gift, he takes it upon himself to help save Kohinata from her loneliness while working to uncover the truth of the situation.
Both of these animes can fit into the romance genre yet also have a serious psychological aspect to both of them. If you enjoyed h20 or Chaos;Head I believe you would be interested in the other too.
The psychological aspect in Choas;Head and H2O are what really make the two series stand out in my mind as being similar. There is also a slight almost to the weird romantic fascination that overtakes the characters making some decisions more difficult than others to bare.