I believe this manga is relatively old, probably from the '90s. I don't recall there being an anime adaptation of it.
At the beginning of the story, a man found the partially destroyed head of an android with the brain still intact. He used parts from other androids he had found to reconstruct her. Her first limbs were delicate and were decorated with flower designs, I think. If I remember correctly, they were destroyed when she took on a powerful android. The man used this android's parts to create strong, sturdy limbs for the android girl.
The girl was cheerful and very expressive despite being an android. She was probably in her "teens," had shoulder-length black hair and was drawn with large, emotive eyes. The man was older, and I think he was a scientist or researcher, as well as a fighter. The other androids that appeared were drawn in great detail, and I think there was some detailed gore.
The last thing I remember is that they were in a bar, and there was a giant android head/snake-like thing that was attacking them.