Mini Octotank No. 8 is a small octopus-shaped combat machine built by Child Emperor. It patrols a designated alert zone and automatically opens fire on anything that moves, standing guard over the young hero during the war on the Monster Association.
Mini Octotank No. 8 is one of the many gadgets that come out of Child Emperor's arsenal, styled after an octopus and counted among his assault machines. It debuts in the manga during Chapter 97 and reaches the anime in Episode 32, serving as an automated sentry rather than a piloted unit.
The device works as a self-directed turret keyed to a set perimeter. Once positioned, it locks onto any motion inside that boundary and keeps shooting at the target. Its trigger condition is tied to carbon dioxide output, so it continues firing until it no longer registers the breath of a living intruder, at which point the threat is treated as neutralized.
Child Emperor both designs and deploys the robot as part of his personal defenses. It proves its worth by gunning down a monster that tries to close in on him from behind while his attention is elsewhere. The machine does not survive the fighting, however, as it is wrecked by Phoenix Man not long after its kill.

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Mini Octotank No. 8 is a small octopus shaped combat machine built by Child Emperor. It serves as an automated sentry that stands guard over him during the war against the Monster Association.
The device functions as a self directed turret keyed to a set perimeter. It locks onto any motion inside that boundary and keeps firing until it no longer detects the breath of a living intruder.
Mini Octotank No. 8 is triggered by carbon dioxide output, meaning it continues shooting at a target until it no longer registers breathing, at which point it treats the threat as neutralized.
Yes, the robot proves its worth by gunning down a monster that tries to close in on Child Emperor from behind while his attention is elsewhere.
Mini Octotank No. 8 does not survive the fighting. It is wrecked by Phoenix Man not long after gunning down the monster that approached Child Emperor.
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