Hyness wears a white cloak to hide his identity. His cloak has golden trimmings, with ancient symbols printed on them, and he wears a veil that covers the bottom of his face. When he is wearing his cloak, his eyes are depicted as small and yellow. The top of his cloak also has the symbol that the Jambastion mages and Pon & Con have. When his hood is knocked off, it is revealed that Hyness has a blue face with a big, floppy nose, chameleon-like eyes, and ears similar to those of Magolor's. His eyes and ears also have yellow stripes on them.
Hyness is depicted as completely insane, with incredibly deranged mood swings. He fits the image of a demented cult leader or priest. When Kirby and his friends encounter him, he first talks calmly and somewhat eerily, but then starts to become furious. He begins shaking his head and flailing his arms rapidly while talking very quickly. In his second phase, he starts making strange angry grunting noises and doing weird dances. His battle theme also seems to elaborate on his insanity.
According to Zan Partizanne's Pause Screen description, he is said to be abusive to the generals. This is evidenced by the fact that he sweeps Zan to his side while walking towards Kirby. After his first phase, Hyness hypnotizes Zan Partizanne and her two sisters, Francisca and Flamberge, and absorbs their life force to restore his own after Kirby empties it. In his second phase he uses their bodies as living weapons; when defeated, he forcefully sacrifices the mages and himself to the Jamba Heart in order to resurrect Void Termina.
Hyness attacks with a variety of magic spells. He begins the battle by shooting balls of dark energy from his sleeves; the balls will briefly arc through the air before homing in on the player. He will then summon a rune resembling the Jambandra emblem (the symbol on his hood and the Mage Generals' hats) to fire sharp picks to the sides of the arena. He can also summon pillars of fire at the sides of the arena, followed by a pillar of lightning that releases shockwaves across the ground. His final attack summons multiple Jambandra emblems around himself; after a moment, they will release freezing winds around themselves. However, if attacked by the fire element, the symbols will disappear.
After Hyness's health is depleted, his hood is knocked off his head and he summons the Mage Generals, draining their energy to restore his own. In his second phase, he keeps his moveset from his first phase, but mainly attacks with the unconscious bodies of his generals. He can throw them at Kirby and Co., causing them to create small rock projections imbued with their unique elements when they land. Kirby can inhale these to get their respective abilities or remove the elemental attribute and get the Stone ability. Alternately, Hyness can grab one of the mages and swing them like a club, dealing elemental damage to anyone he hits. When he gets to half health, he forces the mages to create a Friend Circle; they then roll all over the arena, on the floor, up the walls, and on the ceiling. They then float in the center where Hyness sends the mages flying in different directions, embedding them in the ground as obstacles while dropping elemental stars to their sides; this attack leaves him dizzy for a time. Each of the mages deals damage of their respective element as they impact on the floor in this manner. Once he recovers, he forces the Mage Generals to become a shield; he hides behind him while they float around, occasionally throwing dark orbs. The shield can be broken, and if so, leaves Hyness stunned.
Hyness also appears in the game's boss rush mode, The Ultimate Choice. He appears in four levels of difficulty (Sizzling Threat, Fiery Showdown, Infernal Crisis and Soul Melter).
Hyness, and presumably the Jambastion Mages, were banished to the edge of the galaxy long ago. It is presumed that the Halcandran ancients banished them. According to Hyness, he and the mages were responsible for stopping a "galactic crisis", but it's unknown what the crisis was. Hyness claims the ancients banished them because they feared their power and that they subsequently attempted to erase their existence from history itself. Once they returned from their banishment, Hyness and the Jambastion Mages proceeded to attempt to resurrect Void Termina. However, since Hyness did not fully understand how to break the seal, the ritual went wrong, causing the Jamba Heart to shatter and spread its negative influence across the galaxy. The Jambastion Mages chase after the fragments while Hyness stays behind, continuing the ritual in their absence.
By the time Kirby and his allies reach Hyness, the villain is summoning Jamba Hearts from across the galaxy to restore Void Termina; however, he has not yet accrued enough power to revive his master. After Zan Partizanne fails to stop the heroes, Hyness bats her unconscious body aside and confronts them personally; although Kirby and the Star Allies manage to triumph, he simply offers himself and his minions to Void Termina instead. Their added power allows the Dark Lord to fully restore itself, forcing Kirby and his friends to pursue it in the Star Allies Sparkler.
During the battle with Void Termina, Hyness and the three Mage Generals are seen trapped in cocoons near the monster's core. Freeing them causes them to drop food. In Hyness's case, he drops a bottle of milk. When the second phase is completed, the villains are ejected; what becomes of them after this is not known, as they are not seen again.
Hyness worships a deity of destruction whom he plans to bring back to life. However, a rite gone wrong has led to the dark power he needs being scattered across the galaxy. Now he seeks to gather this power at an altar. Stop him, Star Allies!”
— VS Hyness • Kirby Star Allies
His once carefully concealed face now exposed, Hyness is on the rampage! Tossing the three unconscious sisters around like rag dolls, it’s clear he’s lost his grip on reality. It’s up to the Star Allies to bring an end to this nightmare, and save…everything!”
— VS Hyness (Phase 2) • Kirby Star Allies
Hyness did not fully grasp how to completely break the seal. All that was written about Void Termina in the ancient scrolls was the progenitor of darkness was vanquished by four heroes of yore, using four spears of the heart. After that, they were never seen again.”
— VS Hyness (The Ultimate Choice) • Kirby Star Allies
Bonjam = Greeting Jambuhbye = Goodbye
Jamblasted = Anger Juh? = Huh? Vun = Very
Jamanke = Thank you Japologa = I’m sorry
Jonto = Soon Jaway = I forgot Majaja = Again
Example: “Zan Par…? Jaway majaja! Japologa vun.”
Translation: “Zan Par…? I forgot again! I’m very sorry.””
— VS Hyness (The Ultimate Choice, Phase 2) • Kirby Star Allies
The Jambastion Mages, who are the boss Generals, are referred to as "three sisters" in one of the pause screens. So are they actually siblings or members of a sisterhood of mages? Just like Kirby and Meta Knight's secrets, this is another mystery that stirs the imagination! In the Japanese version of the game, a pause screen says Zan Partizanne was taken in by Hyness, and had sworn loyalty to Hyness after she had received powerful magic. Comparing Hyness's true face and hers, it looks like they're from different races though.”
— Kirby Star Allies Channel Update 5
Juh? What is this…interference? You… You seem to be in my way. Well then… It seems… we do not have enough energy… to revive our Dark Lord… Must we… allow ourselves… to fall… into oblivion? No. NO! No no no no no no! NONONONONONONONONO!!! NOOOOO, I SAAAAY!!!”
— Hyness • Kirby Star Allies
We are the masters of a power driven to the far reaches of the universe, and we have but one desire! Can one such as you possibly fathom how dearly we have clung to this dream across the aeons? How could you! You couldn’t! Never ever ever! We who once faced those who were in such fear of our power that they sealed us away and banished us to the edge of the galaxy! US! As if THAT loveliness wasn’t enough, they tried to erase our very existence from history! RUDE! Only through our magic were we able to overcome their science and achieve great prosperity! We alone were responsible for stopping that repulsive nightmare of a galactic crisis, yet this is how you repay us! This won’t stand! It won’t be forgiven! It won’t be forgotten! Never ever EVER! Those who called us mad, are you listening? You left us at the edge of the galaxy to be forgotten, then went along your merry way, probably living somewhere pretty and peaceful! But know this! Your future is a farce! You have none! We, masters of a matter most dark, vow to be restored, as foretold in the book of legend, which everyone thought was just a fairy tale! It WASN’T! We have already obtained the vessel that contains our Dark Lord, and he will soon awaken and shower us in compassion! Look! The vessel of our Dark Lord is filling up even as we speak! Now the time for his greatness to enter our world has come! Welcome to a new history! A new age! The age of awesome! HAPPY BIRTHDAY, DARK LORD! HAPPY BIRTHDAY!”
— Hyness • Kirby Star Allies
Grace us, Gloriously Dark Looooooord! Huff... Hah... Huff... Hah...”
— Hyness • Kirby Star Allies
Juh? JUH… JUH! JUHYAMBAVITRIGOKOPOKOJAAAH!!”
— Hyness • Kirby Star Allies
Youuuuu… How could you defeat me… THE Lord Hyness… An offering to our Dark Lord… Perhaps if there is…an offering… What should I do… Only one option remains… Those who harbor the greatest of magic, I call upon you… Make it so… Accept my aid… I pledge myself to you… Dark Lord of Destruction… I do this so that… our Dark Lord… may be rebooooorn… Rise, Destroyer of Worlds… RISE, VOID TERMINA!!”
— Hyness • Kirby Star Allies
Hyness's name appears to be a corruption of "highness," befitting his position as the leader of his faction.
Hyness has several similarities to Zant, a villain from The Legend of Zelda: Twilight Princess. Both have violent mood swings, are dressed in a cloak, and seek to restore a higher being who was sealed away. They also both wind up being more insane than they initially appear.
The music that plays when Kirby and friends encounter Hyness is a slowed down remix of the main leitmotif in Friendly Field.
Hyness's music incorporates strong influences from gamelan, a form of traditional percussive music native to the islands of Bali and Java in Indonesia. Gamelan became more well known in Japan following its use in the soundtrack of the 1988 anime film Akira, and has appeared in the music of other video games, such as Squaresoft's Secret of Mana.
Hyness hypnotizes the three Jambastion mages to help him in the second phase of his fight, adding in some of his own attacks occasionally. This method of battle is similar to Taranza's fight in Kirby: Triple Deluxe while taking control of Masked Dedede.
During Hyness's second phase, the Jambastion Mages can be heard grunting in pain whenever Hyness hits them against the ground.
In Hyness's Pause Screen description for The Ultimate Choice in the Soul Melter difficulty, he says "Zan Par...? Jaway majaja! Japologa vun."; which translates to "Zan Par...? I forgot again! I'm very sorry."; this means that Hyness has forgotten Zan Partizanne's name and apologizes for it, which is somewhat contradictory, considering her rematch in the story mode's Pause Screen description says he is abusive to her and her sisters. However, it could also be an indication of his manipulative nature or his insanity.
Hyness appears to be left-handed. This is seen when he pushes Zan Partizanne away, and when he tries to grab one of the Jambastion Mages during his second phase.
Each of Hyness's dances signifies which attack he will use: swaying his head side to side means that he'll throw the Jambastion mages or summon symbols that will create small blizzards, bouncing his head and shoulders means that he will throw Giant dark orbs and summon symbols which fire giant needles to the sides, tilting his body while raising his arms means that he will swing around the mages like clubs, shaking his head and raised arms means that he will summon pillars of fire and a pillar of lightning from both sides of the arena, spinning his head once means that he will use the mages as a shield, spinning his head twice means that he will use all three elemental attacks in the center of the arena, and jolting his arms side to side means that he will throw small dark orbs.
Hyness's first battle theme is called "Puppet Dedication", and his second battle theme is called "La Follia d'amore" (Italian for "The Madness of Love").
Hyness uses Coily Rattler's roar when his hood is knocked off and his face is revealed.