Moomba is a member of an unknown alien race, although there are similar entities known from the Marvel preheroic age of monsters.
Moomba is a member of a race of sentient plants. He and his warriors are able to levitate. They are prodigiously physically powerful and immune to ballistic weapons up to and including cannon shells.
Moomba stood 20 feet tall and was immensely strong- able to destroy a battleship for example.
Moomba also possessed psychic powers, and was able to mindwipe the human race, removing all knowledge of his presence.