Movie
Description
Shishi O is a Yo-kai Hero form born from the fusion of Mera Raido and Kazuma Shishiguro, achieved via the YSP Watch when the correct Y Medal is used in the presence of an associated Onryo.

This form presents a bestial and powerful figure, crowned by a gray lion's head featuring silver hair, red facial markings, and piercing golden eyes. The hero wears a white cape emblazoned with golden flame designs on its back, over a charcoal black shirt marked by a white chest line and fiery sleeve patterns. Ornate, golden-trimmed black gauntlets with fingerless gloves and circular screw head-shaped knuckle plates protect the arms; the left gauntlet integrates the YSP Watch, its shield mechanism sliding aside for medal insertion. The attire is completed by a white belt bearing a fiery emblem, orange pants, and black boots.

An arsenal of specialized attacks is unleashed by inserting specific Command Medals into the YSP Watch. These techniques are Explosive Chains Well Done, Beast Knuckle, Berserker Mode, Steel Pipe Rush, Mechanization, Steel Missile Rush, Beast Gun Rocket Punch, and Defeat Soten Boisterous Dance.

In narrative arcs, Shishi O is a hot-blooded individual, proficient in warfare and guided by a strong sense of morality. The character first emerged in the Y School Heroes Movie before appearing in the anime series. There, in episode 2, Shishi O battled Cyclops alongside Kengo Benimaru. Kyouran no Hanako-san entangled the hero in puppet strings in episode 7, though Little Kommander provided a timely rescue, enabling a retaliatory Explosive Chains Well Done. An attempt to fight the Black Army in episode 8 was cut short by an untimely reversion. In episode 12, Shishi O and Ninetail mounted a diversion against Kamagaeru to secure Kengo Benimaru's victory. Episode 14 saw the character join other YSP Club Heroes to defeat Mist Shadow. During an attack on Aizou-san in episode 20, intended to free Wild Boy, the action instead powered up the antagonist.

In the mobile game *Yo-kai Watch: Wibble Wobble*, Shishi O was available during the limited-time "Yo-kai Academy Y ~Invasion of Aliens~" event from March 1 to March 15, 2020. Players had a chance to befriend the character via the limited Crank-a-kai, and it dealt increased damage to specific "Big Black ohajiki" boards. The character is classified as a Rank SSS Yo-kai from the Tough tribe in this game, but is listed under the Goriki tribe in *Yo-kai Watch: Ukiukipedia Gakuen Y*.

The transformation is heralded by a specific song and quote. The transformation song features dramatic drums and the chant, "♪Whoa! Whoa! Whoa! Whoa! Whoa! Whoa! Soiya! Soiya! Soiya! Soiya! Soiya! Soiya! Soiya! Soiya! Soiya!♪" The character's signature declaration upon transforming is, "Sorry, but I'm goin' wild!" which translates from the Japanese, "暴れてぇ御免!"

The name Shishi O translates literally to "Lion King." This form stands as a distinct hero within the broader Yo-kai Hero system, a process where a human transforms using a Y Medal and a watch device while an Onryo is present.