The Metal Hippoe is a stronger version of the regular Hippoe. Its attack rate is faster, and it has more attack power, along with an ability that only Metal enemies have: taking 1 damage per hit. At 100% strength magnification, it has 80 health in total, with 2 knockbacks.
In some levels, Metal Hippoe can act as an annoying meatshield, such as in Chubby. B. Goode and Prison Destruction, and other times it can be a help for stalling as you build up long range cats.
A certain organization decided to experiment and make Hippoe's body metal. Appears to be weak to critical attacks.
It was reborn via the remodeling surgery of the federal government. Remodeling hippopotamus with a body of steel. Critical attacks seem to be its weakness.
From the very first subchapter, The Legend Begins to Sea of Tuna, this enemy is very hard. However, once you get stronger cats and faster attackers, this enemy is a joke, even at high buffs. For the first time you encounter it, though, use Giraffe Cats to finish it off.