Volume 3 and Onwards
From Volume 3 onwards, it is revealed that Killy was not really human at all. In her attempt to register Killy as a Safeguard, Sanakan, intentionally or not, (re)enabled Killy's Safeguard functions. During the encounter outside Toha Heavy Industries, where he was knocked out from using too much power from firing the GBE, it's seen from his point of view that he can now scan for the Net Terminal Genes automatically. Zuru asks him if anything is wrong, and we see his viewpoint, filled with little windows and analysing the eyes of the person, along with other unknown elements. His response to her question is "I understand what the displays mean now.", implying that he was able to see these things before but didn't know what they meant.
This is where he leaves the room and immediately scans the people outside, even Cibo, who is unaware of his change. However, he senses a strange reading from one of them, even a small scan (possibly x-ray) showed up with a metallic endoskeleton. It was Sanakan, as she was one of the Safeguard, she then activates her functions and starts destroying things with her own GBE. He then apparently 'rejects registration with the Safeguard', and Sanakan tries to kill him, only to be defeated for the time being.
Another attack at the same place involved many Safeguard Exterminators, and one large creature, who possessed a GBE much larger than Killy himself. After shooting the creature with the GBE at full power (Level 4), it hit it, but made little damage. He then later powered up further by connecting himself to several of the now dead Safeguard he killed, to power up his GBE to Level 4 Extra, blasting through the creatures own GBE beam, and destroying it completely.
Later in the manga, Killy is shown to be able to see objects as far away as 3,000 kilometers using his naked eyes. This contrasts his need for binoculars in the volume 1 of the manga. Also during this period, Killy loses his need to eat and instead is able to gather energy directly from power sources in the NetSphere.
Read more about this topic: Killy (Blame!)
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