In Season 1 of That Time I Got Reincarnated as a Slime, Shuna is initially introduced as a high-ranking princess of the ogre tribe, which is struggling to survive after a brutal attack by the orc disaster, led by the antagonist Geld. The ogres, including Shuna and her brother Shion, face dire circumstances as their once-thriving tribe is decimated. When Rimuru Tempest intervenes and defeats the orcs, he takes it upon himself to aid the surviving ogres, offering them protection and a place in his burgeoning nation. Shuna's initial interactions with Rimuru are marked by a mix of cautious optimism and relief, as she begins to see hope for her people through Rimuru's leadership.

As Rimuru's influence grows, Shuna's role becomes increasingly pivotal. Following the defeat of the orcs and the absorption of the ogre tribe into Rimuru's domain, Shuna undergoes a significant transformation. She evolves from a high-ranking ogre into a powerful Demon Lord, a status granted by Rimuru himself. This transformation not only enhances her magical and combat abilities but also elevates her position within the Tempest Federation. Shuna's new status allows her to play a more substantial role in the administration and expansion of Rimuru's growing realm, highlighting her newfound authority and capabilities.

Throughout Season 1, Shuna's contributions are crucial in helping Rimuru manage and develop the Tempest Federation. Her abilities and insights are instrumental in navigating the complexities of leadership, particularly as the federation integrates various races and factions. Shuna's skills in magic and strategy come to the forefront as she assists Rimuru in diplomatic negotiations and internal administration. Her efforts in establishing alliances with other factions, such as the dwarves and lizardmen, demonstrate her adeptness in forging critical relationships and expanding their influence.

One of Shuna's most notable achievements in Season 1 is her role in addressing external threats. As tensions rise with neighboring kingdoms, particularly the Falmuth Kingdom, Shuna supports Rimuru in managing these conflicts. Her presence and expertise are essential in planning and executing strategies to safeguard the Tempest Federation. Shuna's ability to balance her administrative duties with her role in combat scenarios underscores her versatility and dedication to Rimuru's vision for a unified and prosperous nation.

In Season 2, Shuna's role continues to evolve as the Tempest Federation grows and faces new challenges. The federation's increasing prominence brings about both opportunities and threats, and Shuna remains at the forefront of these developments. Her involvement in managing the federation's affairs becomes even more critical as the organization expands its reach and influence. Shuna's strategic input and magical prowess are key in navigating the complexities of this growth, ensuring that the federation remains stable and strong.

The season also delves into Shuna's personal growth and her deepening commitment to Rimuru and the Tempest Federation. As the federation faces external pressures and internal struggles, Shuna's role becomes even more central to maintaining order and addressing emerging issues. Her loyalty to Rimuru and her dedication to the well-being of the federation continue to drive her actions, reflecting her growth as both a leader and a trusted ally.

Shuna's character development is further highlighted by her interactions with other key figures in the series. Her relationships with characters like Shion and other members of Rimuru's inner circle deepen, illustrating the bonds of trust and camaraderie that underpin the federation's success. Shuna's ability to navigate these relationships and work collaboratively with others showcases her growth as a leader and her commitment to the collective well-being of the federation.

Overall, Shuna's journey from a princess of a near-destroyed tribe to a powerful Demon Lord and key figure in the Tempest Federation is marked by significant personal and professional growth. Her contributions in both Seasons 1 and 2 underscore her importance to Rimuru's vision and the success of their shared endeavors. Shuna's evolution as a character reflects broader themes of resilience, leadership, and loyalty within the series, making her an integral part of the narrative and the ongoing development of the Tempest Federation.