Toraoh, also known as Tiger King or Prince of the Demon World, first appears as an antagonist in the Soukaizan narrative. His background reveals he is actually Shouryuuko, brainwashed by the demon lord Doakudaa into serving as an enemy against Wataru and his allies. This manipulation drives his early actions and motivations.

After the revelation of his true identity and liberation from brainwashing, Toraoh undergoes significant development, transitioning from adversary to a crucial ally of Wataru. His relationship with Wataru evolves into a deep and complex friendship, frequently highlighted as a central emotional theme throughout the series and supplementary materials. Dedicated publications analyze this dynamic, emphasizing its foundational narrative role. His connection with Himiko Shinobibe is particularly notable, as she functions as his "Living Emotional Crutch," providing unwavering support during his struggles.

Toraoh's character arc extends into expanded media. Light novels like *Mashin Hero Wataru Tiger King Legend* (*魔神英雄伝ワタル 虎王伝説*) and *Demon Prince Tiger King Den* (*魔界皇子 虎王伝*) delve into his origins, experiences, and identity, offering deeper exploration of his backstory and internal conflicts. Spin-off stories such as *Tora Bull Dream: Makai Ouji Torao Den Gaiden* (*虎ブルドリーム -魔界皇子虎王伝 外伝-*) further examine his relationships and personal journey. Fan reactions to his initial brainwashed state and subsequent suffering, expressed through protests citing his pitiable circumstances, influenced later narrative directions towards incorporating more serious dramatic elements.

Throughout the franchise, Toraoh remains a recurring figure in sequel series, OVAs, and spin-offs. His character consistently embodies themes of redemption, the enduring power of friendship despite transient bonds, and the struggle against imposed darkness. Publications dedicated to the series often position his relationship with Wataru as a focal point for analysis, underscoring its narrative and thematic importance.