Eve is a genetically engineered bio-weapon and young girl. She uses nanotechnology to transform her body. At this point she can only change her arm, but she is supposed to be able to transform her body when she grows. She has to picture something to do it. Raised like a lab rat, Sven treats her like a real person and opens up her world. Sven takes her as his real daughter and has a really soft spot for her. "Golden Darkness" from Kentaro Yabuki's To-LOVE-Ru bears a striking resemblance to Eve in terms of appearance and abilities.
This little girl is sooooo cute i couldnt help but make a fan club for her
Eve is usually referred to as "princess" in the manga.