Mini Octotank No. 8

Mini Octotank No. 8 (ミニタコタンク８号, Minitakotanku 8-gō) was an octopus-shaped robot created by Child Emperor designed to shoot at moving objects in an alert zone until carbon dioxide emissions are no longer detected.

Monster Association Arc
Mini Octotank No. 8 kills a monster trying to sneak up on Child Emperor. It is later destroyed by Phoenix Man.