Billbo-Negg is a heavily armoured Hyper-Zoanoid that appears in the Guyver manga. Four of these creatures were produced and served as the advanced guard for Cloud Gate, Cronos' Asian HQ located in Tokyo. Almost resembling a humanoid tortoise, Billbo-Negg's body is protected by a virtually indestructible shell. It can curl up into a ball and crush enemies like a living steamroller. It is the heaviest Zoanoid on record, though it proved to be no match for Sho Fukamachi as the Guyver Gigantic.