The Lion Inves is an Advanced Inves and antagonist in Kamen Rider Gaim.
A Lion Inves was summoned by Team Red Hot leader Sonomura using a Mango Lockseed to attack Kouta, who transforms into Armored Rider Gaim to fight it. However, the Mango Lockseed ends up malfunctioning as the Lion Inves transforms into a Berserk state before turning on Team Red Hot and attacking them. Gaim defends the team, but th Berserker Inves flees to a populated area and starts attacking people.
Gaim catches up to the Inves and starts fighting it again. The Lion Inves was defeated after Gaim assumed Jimber Lemon Arms and shot it the Sonic Arrow as it leaped at the Rider, destroying it in mid-air.
Another normal Lion Inves was accidentally dug up by Mogura-Roid during an attack by the Badan Empire which was responded to by Gaim and ToQgers. It grew giant after eating some premature Lockseeds but was destroyed by the ToQgers' ToQ-Oh Car Carrier Tank.
Another later emerged along with a Shika Inves from an unseen Crack and attacked Gaim and Bravo as they were exhausted from fighting. The Inves were soon joined by several Komori Inves, but were blocked from attacking the Riders by Gridon before Gaim assumes Kachidoki Arms and destroys the horde of Inves.
A Lion Inves was part of an army of Inves assembled by Redyue to invade Zawame City. The invading Inves were fought off by the Armored Riders of Zawame, with the Lion Inves being defeated by Gridon.
Several Lion Inves were later part of an army led by Grinsha to capture humans in Zawame to power a machine Redyue had constructed to revive the Overlord Queen for Rosyuo. One of these Lion Inves was among the Inves destroyed by Gridon Suika Arms (Odama Mode).
A Lion Inves was part of a group of Inves destroyed by Gaim's Daidai Ittou right before he first met Lapis.
Later, after Kaito Kumon evolved into Lord Baron, a Lion Inves and a Yagi Inves appeared revere him as he announced his intention to destroy the world and remake it in his image. When Bravo and Gridon opposed Kaito, these two Inves and New Generation Rider Marika, overpowered and defeated them.
Several Lion Inves appeared as part of both Kouta Kazuraba and Kaito Kumon's Inves armies during the battle between the two Overlords.