Groribas is an alien general of the Dark Matter Thieves and one of the invaders responsible for A-City's destruction — a hulking, muscular being with green-shaded shoulders and stomach, no eyes, a long tail ending in a second, fourth head, and hands replaced by tooth-filled, crab-claw-like mouths. Fellow general Geryuganshoop singled him out as the Dark Matter Thieves' best warrior.
That reputation never gets tested. Groribas boasts about an acid breath supposedly capable of melting anything as he squares up against Saitama, but he's beheaded by a single, almost indifferent punch before he can prove it — leaving his signature ability entirely unconfirmed on-page.
A large, muscular alien with dark leathery skin. His head has no standard sensory organs and instead forms a huge vertical jaw lined with sharp white teeth — and both hands are replaced by clamping jaw-like appendages, giving him three “mouths” total. Sharp white spikes cover his shoulders, back, and knees, and he has a thick reptilian tail.
Exceptionally boastful, proud of the twenty combat techniques he claims to have mastered, and genuinely frustrated that his opponents keep dying before he can show them off. Fanatically loyal to Lord Boros, and openly bloodthirsty toward anyone he considers prey.
Originated on a distant world and spent decades traveling with Boros, fighting the galaxy’s strongest until he rose to become one of the Dark Matter Thieves’ Top Three warriors, alongside Melzargard and Geryuganshoop.
Ambushes Saitama in a corridor of the Dark Matter Thieves’ ship, mocking the “intruder” and preparing to unleash his techniques. Before he can finish his intro line or use a single move, Saitama decapitates him with one punch. Boros later assumes his “lesser warriors” failed without realizing Groribas — one of his actual elites — had already fallen.
Dragon-level physicality theoretically able to threaten multiple S-Class heroes, plus a claimed repertoire of 20 named techniques (Acid Breath, Double Bite, Purgatory Thorn Grip, Sky Strangle Sunder, Screw Tail Thrust, among others) — none of which he ever got to use.
vs. Saitama — Ch. 32
Tried to ambush him inside the ship to stop his march toward Boros's throne room. Saitama punched his head off before he could even attack — the first of Boros's “Top Three” to die, and proof none of them stood a chance.
Major: Ch. 32. Minor: Ch. 32 bonus material. Mentioned only: Ch. 33.
Lord Boros: his commander, held in absolute reverence. Melzargard & Geryuganshoop: fellow Top Three executives. Saitama: the “intruder” who ended him before he could even attack.
“Gwa ha ha! I’m surprised you made it this far, intruder! But you go no further! You cannot defeat Groribas!”
“It’s too bad I can’t show them all. My opponents always die first!”
The only one of Boros’s Top Three to die without landing a single named technique, despite claiming the largest movepool of the trio — making him something of a “wasted potential” punchline in the series’ lore.
🇯🇵 Japanese Voice Actors
Hamazoe, Shinya
🇯🇵 Japanese
🇺🇸 English Voice Actors
Rogers, Bill
🇺🇸 English