Transformative Weapons

Transformation Weapons are living artificial beings that have what is known as the Transform-ability, which allows them to form and reshape almost any part of thier body into a weapon by using the nano-machines in thier bodies. The purpose of thier creation is to be ordered to kill, so they are raised to be skilled fighters and cold hearted killers. So far there are three who are known as Transformation Weapons and they are a females with the bodies of a child, although they can also reshape there bodies to look more adult like. They're also able to use there ability change there own clothing.

The Organisation
The Organisation is a secret facility that create these artifical beings, one of the scientists part of the Organisation was Dr. Tearju Lunatique who created the first Tranformation Weapon and did it with her own DNA thus giving birth to Eve. Tearju planned on giving her happy childood but the organisation had other plans, to raise her as a cold blooded killer by chasing Tearju away and create more to sell those with bad intensions. However the Organisation was destroyed by Black and set Eve free.

Golden darkness
After the Organisation fell, Eve moved on to be a cold and emotionless assassin known as Golden Darkness. Her title rised up by defeating strong opponents and other assassin's. She  secludes her self from any emotional contact, untill she was hired by Lacospo to kill Rito Yuuki but was convinced by Lala otherwise, so insted she chose to asse ss him claiming that she will kill him one day by staying on Earth, by doing so overtime she finaly opens up to humanity and has shown a kinder side to her and becomes friends with others and starts having love/hate feelings for Rito, she also becomes closer again with Tearju. She is renamed as Yami.

2nd Gen-Transformation Weapon
Some time after the fall of the Organisation in the midst of all the rubble, Mea Kurosaki  awoke from suspended animation and the first thing she ever saw  nothing but destruction everywhere. While wandering around aimlessly through the place lost and confused she meets Nemesis, after thier encounter Mea greatly respects Nemesis as her master who raised and teaches her about the life of living weapon and about how Yami is fact her older sister. Mea does not know life outside being a weapon to kill, she is quite sadistic, childish and low educated about certain things like sex ed, she came to Earth to bring Yami back to being a cold hearted killer again but cannot understand exactly why she stayed on Earth and be friends with Humans. Mea tries to understand her sister's feelings become close friends with Nana, as time goes by Mea see's the world in a different light and slowly opens up to humanity.

Project Nemesis
Unlike the previous two, Nemesis was created by a completely different faction that was organised by the organisation that created Yami and Mea. It is stated by Tearju that this project was a failure. Nemesis is a surviver the project. What caused it's downfall is unknown.

Nemesis
Somehow being the only surviver this project, Nemesis for some reason headed to the original organisation (which was destroyed at the time) met Mea who she took in and taught her about fighting using her abilities and the meaning of there existence, which Nemesis proclaims that it's to kill and having no emotions holding soft emotions holding them back.