If you're looking for anime similar to Needless, you might like these titles. All recommendations are made by Anime-Planet users like you!
After Medaka Kurokami defeated Myouri Unzen (the head of the disciplinary committee), she is recruited by the headmaster to join the "13 Party" - an elite and select group of 13 Abnormal students from Class 13. Medaka discovers that they are taking part in the Flask Plan, which aims to create perfect humans by sacrificing all the students in the school. It is up to Medaka and the rest of the student council to stop it.
The setting is in both anime really similar, in both there are people that have some special kind of powers.
Also the main character in both of them has to face an strong evil organisation which kind of acts all secretly and sneaky and tries to find ways to create the true superhuman.
Also the two main characters have kind of similar power, that they are able to obtain the powers of their opponents.
Welcome to the Little Garden, where people band together in like-minded clans, parallel realities intersect, and the truth of stories comes to life! The masters of this world host the Gift Games, in which extraordinary prizes may be won and lost by gods, spirits, monsters, and people of extraordinary ability. One dwindling clan has lost even its own name in the Games, and seeks new talent to make a comeback. Black Rabbit, a games referee, has brought Izayoi Sakamaki, Asuka Kudou, and You Kasukabe, three individuals with unique abilities, to this world to help return this clan to its former status. For the struggling clan, the stakes have never been higher; but are the newcomers just out to make a name for themselves, or will they really help the clan succeed?
Both anime involve people that have one special power of some kind (Gifts or Fragments) which they use to fight. Both are very colorful with great fight scenes and a deservingly-cocky main character. Despite only one power per person, characters in both have a multitude of different ways to use that power that makes it seem like they have more than one, so to beat them opponents have to figure out exactly what that power is. The main character's power in both is also pretty ambiguous giving them insane amounts of power that can do multiple things (more so in Needless though). There's also a bit of ecchi in each but MUCH more in Needless, while Problem Children is more fantasy and magic. Fans of one will probably enjoy the other as they're similar, both very short and very good.