Arachnus appeared in 2014 video game called Yo-Kai Watch 2. Arachnus (Japanese: 土蜘蛛 Tsuchigumo) is a Rank S, Earth-attribute Classic Yo-kai of the Eerie tribe introduced in Yo-kai Watch 2.
In Yo-kai Watch: Wibble Wobble, Arachnus is a Rank S Yo-kai of the Eerie tribe. He also received an Awoken form called Arachnus Awoken (Japanese: 覚醒土蜘蛛 Kakusei Tsuchigumo). Arachnus Awoken is a Rank SS Yo-kai of the Eerie tribe.
In Yo-kai Watch 3, Arachnus is one of the Yo-kai required to unlock Shogunyan.
As of Yo-kai Watch 4, Arachnus is a Rank S Yo-kai of the Goriki Tribe.
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 spider web 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. Despite this, Arachnus is very passionate over sweets (to the point of declaring war after a disagreement on whether custard donuts are better than cream donuts or not) and has no tolerance for spicy foods.
Arachnus and Toadal Dude start out as enemy generals who start out a war against each of their respective factions, after a series of events in Yo-kai Watch 2 unfold, they call a truce and eventually become allies.
In the first movie, Arachnus is one of the many Yo-kai that Nathaniel has befriended, he comes to his aid when facing off against Dame Dedtime.