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Groribas is a minor villain from One Punch Man. He is a member of the Dark Matter Thieves, and according to himself one of their strongest warriors. Groribas is a muscular humanoid alien with green skin, no eyes and a large flytrap-like mouth, also having flytrap mouths in place of his hands.
When Saitama invades the alien ship, Groribas is dispatched to deal with the intruder. Facing Saitama, Groribas taunts him and boasts about his strength. He prepares to attack Saitama with his acidic saliva, but is quickly defeated as Saitama punches his head off.