The tankiest enemy that appears in the Yuru-i GeGeGe no Kitarou: Youkai Dotabata Daisensou Collaboration. This walking eyeball supports somewhat high health, extremely pitiful damage and rather quick attacks. His weaken isn't anything to be feared about as it only weakens the players units to 50% for one second, however with his fast attacks it nearly permanently weakens them.
As usual, use anything that can outrange this enemy. If for any reason the weaken effect makes you think he is a threat, bring Cat Units that are Immune to Weaken.