TV-Series
Description
Benio Utagawa, also known by her kaiju identity Red King, holds the soul of the Ultra Series kaiju Red King. Her given name "Benio" stems from the kanji for Red King (紅王), and she shares a September 4 birth date with Tomomi Okada/Pigmon.

She features long hair styled as twin drills and wears stockings with garter belts in her transformed state. Her personality projects a tough, strong-willed exterior, yet she privately harbors a fondness for sweet foods and cute objects, a hidden aspect known only to one person. She owns a large Red King plush doll.

As a fighter, she relies primarily on superior superhuman strength in her kaiju girl form. She achieved prominence as the former champion of the "Big Kaiju Battle" competition, renowned for her combat skills. Her first televised appearance showed her defeating Mikazuki Kuroda/Gomora. She later encountered the main trio of Aki/Agira, Miku/Miclas, and Reika/Windom, surprising idolizing Miku.

Her competitive history includes ongoing efforts to reclaim the championship title from the current holder, Zetton. Beyond competitions, she undertakes missions for GIRLS, such as neutralizing Sachiko Dori/Zandrias during a berserk rampage caused by unstable transformation, demonstrating her role in managing rogue kaiju girls.

She exists across multiple adaptations within the Ultra Kaiju Anthropomorphic Project. In *Galaxy Days*, she appears as a student at Tsuburaya School. The POP comic version depicts a significant evolution from her past as a rampaging kaiju to a supportive figure, explored more deeply in later manga volumes.

Her signature traits include maintaining a fierce public persona while concealing her affinity for cuteness, her rivalry with Zetton, and her specialized role in subduing unstable kaiju girls through physical prowess.