This article uses material from the “Arachnus” article on the Yo-Kai Watch Wiki at FANDOM is licensed under the Creative Commons Attribution-Share Alike License.

Arachnus is a character from the Yo-Kai Watch franchise.

The leader of the Bony Spirits faction, he is a Giant Spider who can shapeshift into a human form.

In the XP4 fics, Arachnus debuted in the XP4 Heroes Coalition - Neo-City Diaries.


Arachnus is a humanoid Yo-kai with pale peach skin, eyes with light green sclera and yellow irises, red Kabuki-styled face markings, black hair with yellow streaks, and appendages that simulate spider legs and a ponytail at the back of his head. He wears a red kimono, a purple kataginu with spiderweb designs being held by yellow ropes, a dark blue hakama, and white socks and zori sandals.


Arachnus is the general of the Bony Spirits army, in contrast to his rival Toadal Dude, he is more serious and ground-to-earth personality. Depiste this, Arachnus is very passionate over sweets (to the point of declaring a war after a disagreement on wether custard donuts are better than cream donuts or not) and has no tolerance for spicy foods.

XP4 Fanfics

Arachnus has trouble getting along with everyone due to his persona but after a talk with his rival, he learns to loosen up a little, eventually fitting himself alongside everybody.

XP4 Fanfics

Arachnus is a member of the Heroes Coalitions as a Solo Hero. He also attends the Vanguard Academy as a student.

XP4 Heroes Coalition - Neo-City Diaries

In Chapter 66, Arachnus, alongside Claire Fox and Susanoo, are hiding inside a wrecked building in an abandoned island from an unknown enemy lurking under water.

XP4 Heroes Coalition - Azur Lane

In Chapter 1, Arachnus, alongside Susanoo and Claire Fox, are hiding inside a wrecked building in an abandoned island from an unknown enemy lurking under water when a trio of shipgirls, Sheffield, Edinburgh and Akashi arrives at their hiding spot. After befriending them and sharing information, the two sides were spotted by enemy scouts causing them to leave their hiding place and go separate ways. But Susanoo suggested to follow the shipgirls, believing that an ambush is awaiting for them.

In Chapter 2, Arachnus, alongside Susanoo and Claire Fox, arrives to save Edinburgh, Sheffield and Akashi after the girls got ambushed by shipgirls from Ironblood with him taking out Koln. After the shipgirls from Ironblood retreated, they met up with Enterprise and Belfast, and after introducing themselves, he and Susanoo felt something, and told everyone that their shipgirls' comrades are in danger.

In Chapter 4, Arachnus, alongside Susanoo, Claire Fox, Enterprise, Belfast, Sheffield, Edinburgh and Akashi met up with Javelin and Laffey off-screen. They later met the other shipgirls and the Full Force Guerrilla outside the abandoned island, Arachnus was then told that he, Susanoo and Claire are needed for another mission, so he said his goodbyes to the shipgirls and went back to Neo-City.


Arachnus is S Rank Earth-attribute Yo-kai and is a skilled fighter.


  • Arachnus is based on the purse-web spider youkai called tsuchigumo ("ground spider"), which is also his Japanese name. They are typically evil masterminds that use illusions and trickery to lure their prey, or inflict them with supernatural diseases. The most famous one disguised as a servant and secretly administered poison to the hero Minamoto no Yorimitsu, until he saw through its illusions and struck it down. "Tsuchigumo" was also a pejorative name for gold miners of the Edo period, who polluted rivers with the mercury used to sift gold, and were thus likened to the earth-dwelling poison-spreaders.


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