Ishruna operates as a promoter within Battling's underground gambling scene, a sport featuring armored troopers. She secures Irvine Leiceater, who fights anonymously as "The Dark," for rigged arena matches. Their arrangement requires Irvine to deliberately lose fights against the pilot Paygun, ensuring Ishruna's financial gain. These rigged outcomes ignite the central conflict when Paygun uncovers the deception, triggering violent consequences that endanger Irvine and his sister, Donna.

Wealthy and ruthless, Ishruna approaches her dealings with cold pragmatism, distinguished by her hair drills and headband. She focuses solely on leveraging fighters for profit, orchestrating fraudulent matches without hesitation. Her initial manipulation sets the escalating hostilities in motion, though her direct involvement in later events remains confined to this setup.

Her background and motivations beyond profit are undefined, with no character development indicated outside her role in facilitating the rigged matches. Her interactions primarily advance the plot through her contractual agreements with Irvine.