Hisoka

An antagonist from HunterxHunter.

Sadomasochist Pedoclown
Hisoka is a Hunter, someone who is at the top of humanity. He is always in search for strong opponents, and would spare those with great potential in order for them to get strong enough to actually challenge him.

Season 5
Somehow his search for powerful foes has lead him to the world of The Final Rumble. Sensing the strong auras coming from TFR, he has joined in a quest to find the fight that will fill him with the truest of joy.

Episode 1
Sensing great fury from a being, he interjects into the fight, and defeats it.

Episode 11
Is booked in a match against like-minded fellow psycho clowns. The clowns instantly hit it off in their love for being deranged madmen.

Season 6
Hisoka feels a deep admiration for Mr. BANS and his great power, and wishes he could've participated in the Death Game to get the fulfillment of a fight to the death.

Episode 3
Thus, it comes as little surprise that the clowns are all part of the conspirators with BANS and Kirei.

Episode 4
After the bomb's explosion, they head to the GM Office during the confusion.

After Sakakura Juzo beats JOKER, he steps in to keep him occupied him next. Sweet Tooth also joins in to attack Fred.

Escapes Rumble-17 with the rest of BANS' faction.

Episode 7
12 years later, Hisoka is now a "magician" and with JOKER and Sweet Tooth, they form The Circus. They now work for BANS Army under Dark Serge and are currently in Serge's Fort when The Final Resistance's raid begins.

Hisoka finds the seemingly lost Koga and decides to show him a "trick" but (through a very lucky rope grab and chat insistence) Koga defeats him with his Syncope-Inducing Demilune Kick.

Episode 8
After taking the FORBIDDEN SIP, Komaeda has become Clownmaeda and joined The Circus. He offers Tatsuya his Bloon.

Episode 9
After Tatsuya rejects Clownmaeda's Bloon and make Clownmaeda sad, the circus is SEETHING and the voices tell JOKER Tatsuya is headed to The Factory.

After finding him, they start beating Tatsuya up, when Kadoya and Makoto show up. The clowns intend to kill them, but Makoto, having regained his will to live thanks to his friends, tells Kadoya to take Tatsuya and run for the sake of everyone. As the clowns pursue, Makoto closes the door and fights them alone.

The clowns don't have any compassion on him and beat him into a pulp.

Episode 11
The circus is taking their boy Clownmaeda to McDonalds to cheer him up, when Dlanor A. Knox, who Dutch's group is taking there as well, asks to get the Bloon. A fight breaks out between the adult groups, while Dlanor and Clownmaeda agree to exchange the Bloon if she wins.

Episode 12
The Circus contact God-Emperor II, the greatest assassin of BANS Army, to take down Suou Tatsuya. BANS initially insists he decline as he carries the Summoning Key within him, but he insists he is immortal.

Episode 13
Along with their new friend Tricky, the voices set up a trap for Tatsuya and Power as they are on their way. But before they can kill them, Delta shows up and sends his Delta Squad of super engineered soldier. But even then, the clown's strength is unhinged enough to beat them.

Episode 14
On their way, they pick up Rando who has been clowniefied, and send him to protect Clownmaeda on their way to Chris' Dungeon. However, Clownmaeda's speech makes Rando doubt himself.

Episode 15
The clowns are set up against Tatsuya's Party, and plan to take the stone as the voices instructed. Tricky is sent to collect clown farts to brainwash them. However, before the 3-on-4 fight can begin, Rando shows up, having steeled himself to do the right thing. This incurs the fury of the betrayed clowns, who go through Tatsuya's team like it's nothing.

As everyone's on the ground and the clowns move in to finish them, Kadoya's voice resonates within Tatsuya and encourages him to defy his destiny, and summoning a Kamen Rider Persona, he wills himself to stand up and protect everyone. Casting Deadly Burn on JOKER starts to burn away his mask, and the sheer force of his determination in his eyes is enough to scare even the clowns into fleeing. Clownmaeda stares at him and smiles, saying that he's glad he could embolden his hope, and walks away.

Season 7
Looking to settle something with an adversary, Hisoka finds Bogdanoff Championship Wrestling.

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Proves it was a fluke and wins.

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Beats some gem girl.

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Stomps on some womeme.

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When The Joker gets drafted to BCW, the two find a mutual love for clowning, and decide to form a tag-team: The Circus.

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Together, they clown the champions and win the tag titles.

Episode 9
They follow Gale's plan to win the 4v4, but the final stretch of the match turns into a solo fight between Hisoka and Akasaka Mamoru. Even with his rubber nen to defy death, Akasaka barely has enough power to defeat him and win.

Trivia

 * Despite popular belief, O MY RUBBER NEN is in fact not an asspull.