If you're looking for manga similar to Elfen Lied (Pilot), you might like these titles.
Mimia-Hime is the story of a wingless girl living in the future on a planet inhabited by people with wings, magic, and telepathy.
Set on a frozen planet littered with alien artifacts, Ningyou no Kuni weaves a tale of a young man and his small but fateful encounter.
After being sentenced to death, the girl Gladiolus was sent to a planet inhabited by robots and is forced to fight as a gladiator to win her freedom!
Follows Kuroitsu, an assistant researcher in the superhuman research & development department of Agastya, a villainous secret organization that battles with heroes who try to save the world. Kuroitsu lives a busy life in Agastya, caught between the absurd requests of her bosses; making presentations; implementing new features into superhumans; and getting results within the allotted time, budget, and spec requests; all without vacation.
A catastrophic event has thrust the world into an age where disease begets disease. Ostracized for his unconventional treatment methods, the dark Doctor Ikuru is stricken with an immortalizing disease. On a desperate mission to die, he must save a world desperate to live. Go to the very edge of humanity and back in one man's search for an ending to his suffering, all while saving the world he wishes to leave.