The Three Tempest Brothers

The Three Tempest Brothers (テンペスト三兄弟, Tenpesuto San Kyōdai) were a group of Mysterious Beings and members of the Monster Association.

Appearence
One of the brothers looked like a bug, one had horns and six eyes, and one looked like a squid.

Plot
The brothers attempt to defeat Saitama, but the hero easily kills the first one with a single punch. The other two run away.

Abilities and Powers
Not much is known about their abilities.