Mysterious Joker

Joker (ジョーカー, Jōkā) / Jack Jones (ジャック・ジョーンズ, Jakku Jōnzu)

Voiced by: Ayumu Murase[1]

A phantom thief who performs miracles, he likes to steal treasures that have high value. When not stealing treasures, he spends his free time rolling around lazily, watching TV, reading manga, and playing video games. He hates doing laundry, cleaning up, and cats. He also loves to eat curry dishes. Before he became a phantom thief, he lived in a mansion with his parents until they died in a plane crash (shot down by Clover), and was known as Jack Jones.

Also known as the "miracle maker", "phantom thief of miracles", or "magical boy" because of his wondrous miracles and his super smart brain.

He's dressed up like a girl before, which was a success, beautiful enough to make three men fall in love (but they all found out that he is a male since Joker told them), and he is good at make up too, which he always uses to disguise the scar over his left eye without anyone knowing it was there.

In the manga, Joker marries Queen and have a son and daughter in the future.

Hachi (ハチ)

Voiced by: Yumiko Kobayashi[1]

Joker's ninja apprentice. He is happy-go-lucky and quite clumsy. He was born and raised in a ninja village, though he was a clumsy failure. He strongly adores Joker and makes sure to protect him. He refers to himself as Oira (オイラ) and tends to end his sentences with ssu (～っス), a shortened variant of Desu (です). He is very good at housework and cooking.

Spade (スペード, Supēdo) / King (キング, Kingu)

Voiced by: Hiro Shimono,[1] Mizuki Watanabe (Childhood)

Joker's rival. He is a smart phantom thief who plans by collecting and researching information before acting. He is somewhat of a prankster and prideful in a different way from Joker. When he acts up too much, he often gets a fever. He trained together with Joker and Queen when they were young under Silver Heart.

Diamond Queen (ダイヤモンド・クイーン, Daiyamondo· Kuīn)

Voiced by: Miyuki Sawashiro[1]

Silver Heart's "granddaughter". She is a phantom thief who trained alongside Joker and Spade. She is energetic, cheerful, and often gets into trouble. She is bad at cooking, but she is very skilled at using a knife. When she was a baby, she was known as Queen Emerald (クイーン・エメラルド Kuīn· Emerarudo) and her parents were murdered by a minister (Professor Clover in the anime). Feeling sorry for her, Silver Heart decided to raise her and changed her name to Diamond Queen. In the manga, she ends up marrying Joker and has two children: a son and daughter, in the future.

Silver Heart (シルバーハート, Shirubā Hāto)

Voiced by: Bin Shimada[1]

The teacher of Joker, Spade, and Diamond Queen. He is a legendary phantom thief who has been called the Silver Magician. He is a genius, but has a sketchy personality and hates anything bothersome. Sometimes, he ends up hurting his back. In truth, he thinks of Joker and the others as his own real children and grandchildren and cares about them, but he won't admit it due to him being embarrassed. Before he became a phantom thief, he was a secret agent for the French government, Agent Silver. He lost his left eye on a mission and encounter with Agent Clover (Professor Clover), and has worn a monocle since. He's also been on missions with a fellow agent, Agent Purple, such as taking down Jackal, before that. In the anime adaptation, he often breaks the fourth wall to explain certain important events in the episode, such as the tricks Joker performs. As a running gag throughout the series, it often features him breaking his back.

Dark Eye (ダーク・アイ, Dāku· Ai) / Ai (アイ, Ai)

Voiced by: Kenichi Ono, Yumi Hara (Ai)

Spade's assistant. Like Hachi, he is very good at housework and cooking. He is very reliable when it comes to supporting Spade's acts. Dark Eye is actually Ai, the eldest sister of the "Shuffle Sisters", an idol group.

Roko (ロコ)

Voiced by: Misaki Kuno

A dog who is always seen with Diamond Queen. Roko was part of an experiment to create genetically modified animals, which resulted on his abilities to speak and emit a destructive sound wave. Although Roko hangs with Queen, he was named by Joker, and such the two are good friends. The origin of his name comes from a Corn of Japanese word being Tomorokoshi (トウモロコシ). His experiment number is 101.

Phoenix (フェニックス, Feniksu)

Voiced by: Yoshitsugu Matsuoka[1]

Also known as Akai Tsubasa, Phoenix is an alien who has been stranded on Earth for more than 10,000 years, on a quest to find his spaceship in order to return home, and in that, he often comes into contact and clashes with Joker throughout their respective attempts to find the treasure - Phoenix's spaceship.

Hosshi (ホッシー, Hoshii)

Voiced by: Atsumi Tanezaki[1]

Real name Acrux, Hosshi is an alien, cat-like who was the old companion of Phoenix who takes a liking to Joker and Hachi, thus accompanying them since their initial contact.

Dogusaburō Oniyama (鬼山毒三郎, Oniyama Dogusaburō)

Voiced by: Naoki Tatsuta[1]

The head of the police department's anti-phantom thief department. He despises Joker and tries his hardest to capture him, however, his attempts almost always backfire on him. Despite often being played for comic relief, he has his moments of seriousness. Oniyama takes his work seriously, and his dedication and strong morals have earned him Joker's respect. His last name is a pun on the Japanese yōkai Oni. He has an only daughter named Haruka Oniyama. Despite constantly being at ends with each other, Oniyama has been shown to care for Joker, such as being worried when Joker was poisoned and when he desperately called Joker to warn him as missiles were fired towards him.

Ginko Kurosaki (黒崎ギンコ, Kurosaki Ginko)

Voiced by: Yuko Hara

A police officer who assists Oniyama.

Momo Shirai (白井モモ, Shirai Momo)

Voiced by: Haruna Sakurai

A young police officer who also assists Oniyama.

Kyotarō Hayami (速水京太郎, Hayami Kyotarō)

Voiced by: Ryota Asari

A genius high school student-detective who has paraplegia.

Professor Clover (プロフェッサー・C(クローバー), Purofessā· Kurōbā)

Voiced by: Jūrōta Kosugi

The leader of his gang of violent, criminal thieves. He often thinks up villainous deeds and is the one responsible for the murder of Joker, Spade and Queen's parents. Before becoming Professor Clover, he was an agent of the Federation, Agent Clover, who was defeated by Agent Silver (Silver Heart) 50 years before the events of the series. In that mission, he lost his right arm in an encounter with Agent Silver and has a weaponized, mechanical metal arm as a replacement since.

Lady Doubt (レディー・ダウト, Redī· Dauto)

Voiced by: Jenya

Professor Clover's shapeshifting cat assistant. She is extremely loyal to the Professor.

Shadow Joker (S（シャドウ）・ジョーカー, Shadō· Jōkā) / Cyan (シアン, Shian)

Voiced by: Sōma Saitō

A rival phantom thief who looks similar to Joker. He once worked for Professor Clover and Lady Doubt.

Mister Kaneari (ミスター金有, Misutā Kaneari)

Voiced by: Nobuo Tobita[1]

The representative of the Gold Group. He's very wealthy and uses most of his money to set up traps to defeat phantom thieves that come to steal his treasure, Joker and company in particular. He has a stuffed teddy bear whose nose acts like a switch and an explosive device and usually when Joker steals his treasure he accidentally punches its face making the location he is in explode, including his mansion, yacht, restaurant and hot spring.

Kaneko (カネ子)

Voiced by: Aki Kanada

An anime-only character. A 20-year old lady who assists Mister Kaneari. In season 3, she's revealed to be able to turn into her true self Commando Satsuko, a huge muscled warrior who has reached the full potential of her feminine virtues.

Rose (ローズ)

Voiced by: Akane Uchino

Shadow Joker/Cyan's twin sister. She is actually a witch with time manipulation abilities.

DJ Peacock (DJ・ピーコック, DJ· Pīkokku)

Voiced by: Masahito Yabe

A hyperactive announcer who provides daily reports at the Underworld Net News (裏社会ネットニュース Urashakai Netto Nyūsu).

Princess Paprika (パプリカ姫, Papurika Hime)

Voiced by: Fumiko Orikasa

The young, peace-loving monarch of the Saffron Kingdom.

Chappa Ti (チャパ・ティー, Chyapa Ti)

Voiced by: Emiri Kato

An Indian boy Joker encounters who is known as a "miracle child" or "The Boys with the Eyes of God" and who is said to have the ability to foresee the future.

The series was awarded the 58th Shogakukan Manga Award in the Children's Category.[12]

The series has received generally positive reviews, with praise for its art style, characters and unorthodox mix of light-hearted elements with dark undertones, but criticism of its pacing.

• Official anime website (in Japanese)
• Mysterious Joker (anime) at Anime News Network's encyclopedia