The Unknown man Enemies

Arakawa is an aspiring scientist trying to find the vaccine to solve the “Diclonius problem.” In the manga she does find the vaccine however in the anime she does not.

A member of SAT, he is a top of the line soldier fighting a vendetta against Kaede (aka Lucy) for mutilating him.

Elfen Lied's Main Character and Love Interest of Lucy/Nyuu and Yuka

Lucy; or her real name Kaede, the original Diclonius and source of all the Siplets.

Mayu is a 14 year old runaway who lives with Kouta and company, being one of the first main characters to see who Lucy really is.

A Silpelit Diclonius who is kept in a research facility her entire life until secretly being released after a brutal battle against Lucy.

The nicer child-like side of Lucy's personality, she has a very limited vocabulary.

Kohta's cousin around his age and moves in with him at the inn. She in both versions has feelings for kouta.