If you liked
Soul Eater
|
...then you might like
Pandora Hearts
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Pandora Hearts and Soul Eater center around a group of people fighting against some type of monster that's created from a dark evil. Each group is made up of a large collection of characters. Several character similarities can be drawn. There's Death the Kid (SE) and Gil (PH), Spirit (SE) and Oz (PH), and Maka (SE) and Alice (PH), just to name the main ones. Other character similarities are really small traits.
If you liked
Tsubasa Chronicle
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...then you might like
Druaga no Tou: The Aegis of Uruk
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Tower of Druaga and Tsubasa Chronicle show a group of characters that are traveling together for their own goals. Magic is used in both series, but in different manners. Some of the characters have similar traits.
If you liked
Fruits Basket
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...then you might like
Ouran Koukou Host Club
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Fruits Basket and Ouran High School Host Club have the lead female being forced to stay with a group of men. They both have a high school setting. There are many character similarities: Momiji (FB) and Honey (OHSHC), Hatori (FB) and Kyouya (OHSHC), and Kyo (FB) and Hikaru (OHSHC), just to name a few.
If you liked
Tsubasa: RESERVoir CHRoNiCLE
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...then you might like
Fullmetal Alchemist
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Fullmetal Alchemist and Tsubasa RESERVoir CHRoNiCLE deal with the lead protagonists trying to get something back that deals with one of them. To get to the thing they want, there is some conflict with an opposing side which is made up by a majority of the antagonists. FMA and TRC share the same genres as well.
If you liked
Karneval
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...then you might like
Crimson-Shell
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Karneval and Crimson Shell have a story surrounding an organization that's trying to rid the world of something. This organization allows in new comers, which are some of the main characters to each story. Character wise, there are some similarities: Gareki (Karneval) and Xeno (CS) and Tsukumo (Karneval) and Claudia (CS) are the only ones I can really make - and the second one is only minor details. The feels for each story are pretty close as well.
If you liked
D.Gray-man
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...then you might like
RustBlaster
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Most of the similarities are in the characters. Rustblaster is all vampires, save for one person, and there's a vampire in D.Gray-man. There are many character similarities: Allen (DGM) and Aldread (RB), Komui (DGM) and Sakihito (RB), and Fou (DGM) and Kodachi (RB), just to name a few. Other similarities are with the feel and flow of each manga.
If you liked
D.Gray-man
|
...then you might like
Karneval
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D.Gray-Man and Karneval deal with fighting an opposing force that is threatening to them, or the world. They have kind of the same feel, except that the main protagonists are completely different. There are other characters that are similar though: Kanda (DGM) and Gareki (Karneval) and Lavi (DGM) and Yogi (Karneval) are the main ones.
If you liked
Beautiful Name
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...then you might like
7-genme wa Himitsu.
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7th Period is a Secret and Beautiful Name deal with characters that need to deal with events in their past that keep them from being accepted, so to speak, and they both take place, mainly, in a school setting. Shun (7th Period) and Karin (BN) have many things in common, and they both have some issues that keep them from the male protagonist for a while.
If you liked
Diabolo
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...then you might like
Soul Eater
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Diabolo and Soul Eater have a story surrounding a set of two people fighting against an evil force that's threatening the world. Some characters similarities can be drawn as well: Rai (Diabolo) with Stein (SE) and Ren (Diabolo) with Spirit with be the closest, but Ren and Rai aren't exactly like Spirit and Stein - just in certain parts.
If you liked
Love Recipe
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...then you might like
Manga Mitai na Koi Shitai!
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Love Recipe and Fall In Love Like a Comic focus around a mangaka using their relationship with another person to better their manga and how they deal with romance. Love Recipe is funnier while Fall In Love Like a Comic has a lot more drama. There aren't a lot of character similarities, but the stories are really close to identical.
If you liked
Love Recipe
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...then you might like
Sakka, Dorei wo Kau.
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Love Recipe and Author's Pet focus around two people, an author and another person, that fall in love. The story goes through their relationship and how it affects the author's writing. There aren't too many characteristics that are similar, and the art isn't quite the same, but the stories are almost identical.
If you liked
D.Gray-man
|
...then you might like
Pandora Hearts
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Pandora Hearts and D.Gray-Man have stories that are focused around a group of people protecting the earth, or the people they love, from dark monsters that reek havoc on the world. There's also a lot of similarities between characters: Break (PH) with Lavi (DGM) and Oz (PH) with Allen (DGM) being the biggest similarities that I can make.
If you liked
Tsubasa: RESERVoir CHRoNiCLE
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...then you might like
Pandora Hearts
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Pandora Hearts and Tsubasa RESERVoir CHRoNiCLE have the main goal of the male protagonist trying to help the female protagonist get their memories back. There are some great conflicts, both mental and physical, that show in both series for that reason. There are a lot of character similarities as well: Break (PH) with Fai (TRC), Gil (PH) with Kurogane (TRC), and Shalon (PH) with (TRC). There are a few other characters that are similar to each other, but those are the main ones.