Hyakkimaru Koga
Hyakkimaru, as he appears in episode 12.
Name Hyakkimaru Koga
Gender Male
Nationality  Japanese
Occupation Ninja
Affiliation Koga Ninjas
Voice Actor Morikubo, Shoutaro
English Voice Actor {{{englishva}}}
Physical Status
Weapon of Choice Two swords, Ninjutsu
Abilities Various Ninja Abilities
First Appearances
Manga Chapter 14
Anime Clash! The Dark Ninja Army
Hyakkimaru Koga is a side character in Kaitou Joker, and Hachi's childhood friend.


Hyakkimaru has brown eyes and scruffy red hair.


Hyakkimaru is extremely defensive of Hachi, and has been ever since they were in school together, and will actively fight people should he believe they are leading Hachi down the wrong path or otherwise mistreating him. Hyakkimaru has a fondness for chikuwa.

History Edit

Before Series Edit

Haykkimaru was a ninja born in the village of Koga. He was known as "the one ninja genius that comes once in a decade." Despite his popularity amongst the other ninjas, Haykkimaru befriended and protected Hachi from bullies. He now protects Koga castle.

Abilities Edit

Haykkimaru is very skilled in the ninja arts and is also an excellent swordsman. Some of his main ninja abilities are:

Screen Shot 2017-04-21 at 11.52.27 AM

Koga's Dragon King Inferno ninja art

Leaf-Hiding Technique: Winds with leaves scattered around it will surround an opponent, confusing them on to where Koga is hiding. He will then strike. This ability also allows him to move around quickly.

Dragon King Inferno: A Koga Secret Ninja Arts technique where light pink flames turn into a dragon and engulf it's target in flames.

During Hachi's explanation of Koga's skills to Joker, he mentions that Haykkimaru has demonstrated he can also use:

Water Strider Technique: The user wears wood on their feet and then glides on water.

Flying Squirrel Technique: A technique where you attach the ends of a cloth to both feet and grab the other two ends with both hands, and then glide through the sky.

Shadow Clones Technique: A technique where the user makes several duplicates of themselves.

In order to stop running foes, Koga will attach a chain to one of his blades and throw it at the target.

Relationships Edit

Hachi: Edit

Screen Shot 2017-04-21 at 11.56.12 AM

Hachi meeting with Koga once again

Koga has been friends with Hachi since childhood. He would always protect Hachi from being bullied as well as teaching him things like throwing shurikens. When he found out that Hachi became a apprentice to Joker, he immediately rejected it, saying that he would only lose his life. However after Hachi successfully stole the "Golden Sachikos" from him, Koga saw how much Hachi has changed and began to accept Hachi's desire of becoming a Phantom Thief. He even offered to re-train Hachi if he ever decided to become a ninja again, but Hachi politely refused stating that he had made up his mind on becoming a Phantom Thief. (Making Joker give a smile of relief.)

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Koga giving Joker a ninja suit as an apology

Joker: Edit

Koga originally disliked Joker due to him thinking that Joker abandoned Hachi for the treasure. However when he learned that it was just a clever trick, he grew to accept Joker. Koga even happily notes that Hachi changing is probably due to Joker's influence as well. After their first encounter, Koga became more friendly with Joker and even gave Joker a ninja suit to wear after he had tore his cape by accident.

Trivia Edit

  • Koga is the "one ninja genius that comes once in a decade".
  • Koga is fond of Chikuwa and has a secret stash of them.
Kaitous and Partners Joker  · Spade  · Queen  · Arsène  · Phoenix  · Acrux  · Hachi  · Roko  · Dark Eye  · Silver Heart  · Lucky Pyramid
Villians Shadow Joker  · Professor Clover  · Lady Doubt  · President D  · Spider Ace  · Red Scorpion  · Doctor Neo  · Sniper Genma
Reoccurring Characters Shuffle Sisters  · Momo Shirai  · Ginko Kurosaki  · Rose  · Dogusaburō Oniyama  · Mister Kaneari  · Kaneko  · DJ Peacock  · Ali  · Viridian  · Captain Blue  · Hyakkimaru