 If you liked
Soul Eater
|
 ...then you might like
Akame ga Kill!
|
Both are stylish shounen manga that present themselves as light-hearted, but regularly turn grim. Soul Eater has a halloween kind of theme that occasionally goes overboard while Akame ga Kill! has vivid displays of corruption and a rule saying if "Teigu" users fight, one will always die. They also both feature a particular city as the main location and most villains range from twisted to oh god what.
Akame ga Kill! is still quite a bit more down to earth than Soul Eater, but in return, it's also harsher.