Ant Runt

"From Kamen Rider Black RX".

Ant Runt:
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A white-haired black and red ant monster that was loyal to Gedorian. He can create tornadoes and manipulate soil to bury people. He attacked a playground and its surrounding areas until Kotaro and Joe battled him. Kotaro transformed into Kamen Rider Black RX to fight Ant Runt (with Shadow Moon secretly observing the battle). When Ant Runt created a boulder, Kamen Rider Black RX became Robo Rider. Robo Rider proved useless against Ant Runt as the monster clogged all of Robo Rider's joints with dirt. Becoming Bio Rider, he easily maneuvered against Ant Runt causing the monster to retreat and everyone becoming unburied. He and Gedorian later crashed the battle between Bio Rider and Shadow Moon. Ant Runt trapped Bio Rider and Shadow Moon in an anthill. Ridron freed them and Bio Rider turned into water to attack Ant Runt. Bio Rider reverted back to Black RX and destroyed Ant Runt with the Revolcane.

(c)Toei