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.
This enemy is an absolute joke and is barely a threat at all. The only time he is an actual threat is in Return of Terror. You can just use Giraffe Cats and some meatshields to kill him, or if you have any cats that deal critical hits, use them. Even Moneko is strong enough to kill this enemy, although she needs to be protected by meatshields and needs to deal a critical hit.