TV-Series
Description
Kakuryū serves in the Decepticon Dinoforce under Deathsaurus. Renowned as the team's least intelligent member, he exhibits extreme clumsiness and a stooge-like demeanor, earning the label "idiot's idiot" from his peers. His childlike innocence manifests in a preference for dancing, playing, and sleeping over combat. He displays a particular fondness for small creatures, especially insects, finding them "cuddly-wuddly adorable."

His chronic incompetence frequently causes mission failures through errors like forgetting to install bomb ignition plugs or falling for simple human decoys. Despite this, Kakuryū shows persistent dedication, typically crying after each failure but renewing his efforts with enthusiasm for the next assignment to please his teammates and commander Goryu. Goryu often physically disciplines him, establishing a dynamic likened to Goryu being "Moe" to Kakuryū's "Curly."

Physically, Kakuryū possesses significant but poorly controlled powers: his massive feet generate small earthquakes, and his arms manipulate limited weather patterns. When merged with his semi-autonomous Triceratops shell, he creates the impervious "Kaku-Tricera Field" defensive barrier.

Throughout the Victory cartoon, Kakuryū participates in Decepticon operations on Earth, including assaults on Lunar Base, energy plants, and human cities. His blunders repeatedly jeopardize missions: he accidentally sets himself on fire, collapses structures onto himself, drops uranium canisters on Goryu, and fails to guard prisoners effectively. During a Marine City invasion, he is captured by Autobot Blacker and reveals the neutron bomb plan under duress. Later, he inadvertently allows human captives Jan and Holi to escape by being fooled by a drawing placed over a security camera.

A pivotal moment occurs when Deathsaurus abandons Kakuryū and the Dinoforce during the sinking of Atlantis. This betrayal, coupled with earlier displays of loyalty like leaping to protect Goryu from Star Saber's attack, culminates in his defection to the Autobots. He joins the Dinobots, participates in the Power Core Combiner program, and adopts the new identity "Grimmaster" (or Grimstone). This transition doesn't eliminate his inherent clumsiness but aligns his role with his more heroic disposition.

In comic continuities, Kakuryū undertakes intensive personal training to earn respect, though his tactics remain inept, such as ambushing Star Saber after a three-day underground stakeout. When defeated and facing death, he displays defiant courage, though Star Saber spares him. In the Shattered Glass universe, an alternate Kakuryū exists as a heroic Decepticon created by Wheeljack, later gaining transformation abilities through Omega Terminus.

Post-war, Kakuryū works at an amusement park.