After the Cybroid wars, she's looking for her lost friend and family. Being now partially cydroid, she's not welcomed the slightest bit by other survivors of the wars. They're all very weary, assuming she was part of the enemy's armies and/or spy clones. She's rather better seen gone and comming and also there are starting rumours of her appearence to towns being a sign of bad omens. 

Her true name was Iseki. She was a little happy cream and tan dog with a small family. The whole family still lived in one appartment. Mother, father, her little 'baby' sister and grandma. (both her and her baby sister were from a litter of one) They used to have a little snack stand, where they made and sold local treats.  little family buisness!
She was truely happy before the war started. When things started to turn out bad, they thought they's be safe in the city, and didn't leave like a lot of their neighbours did. When the cydroids took over the city, it was too late to escape.

When the appartment building was under attack, Iseki sacreficed herself to the Cydroids, trying to save the lives of her friends and family there to hold the cydroids up and let them escape. By letting herself be capured for experiments, she hoped she could spare a lot of others for the same fate.
She was heavily experimented on heavily replacing some of her (internal)bodyparts with cydroid material to see how far they could push her.
To see how flesh would react to cydroid in order to produce more and better clones for the war. Some of her spots had turned purple because of the experiments, and some flesh also turned into a purple/blue ish hue because of them.
Some of the cydroid tech was placed on top of her skin, making it visible for everyone to see. Because of an attack gone wrong, her eye was replaced by a bionic one. A lot of cydroid tech has been implemented internally, it does make her vunerable to water. As she might suffer from short circuit and basicly shut down a little. She doesn't require batteries, as the cydroid mech powers itself up by her movements. Which might make her a little of a 'slow start' when waking up in the morning.

Because of her appearence, she now goes by Cyber,  nickname she had gained through time from a few friends she had while improsioned.
Sadly almost all of the friends she had while being 'in there' perished because of the experiments. She and a two others from the experiment facilities were able to escape a month before the war ended. They did get seperated in the chaos of escape and Cyber didn't see any of them again thus far. 

The little bracelet she is wearing was a gift from a younger 'baby' sister. And she'll do anything to keep it close, as it's the only physical thing she has still remaining from her family.
It kept her going remembering them when imprisioned by the cydroids. And why she was there, to protect them form harm.

https://www.youtube.com/watch?v=8Zx6RXGNISk