A Disturbance in the Forest Arc[]
After Rimuru arrived at the scene where the Ogres were battling Rimuru's subordinates, she was the first to recognise his mask and come to the conclusion that he was related to the masked Majin that attacked their village with the Orcs.
However, after seeing how merciful Rimuru was being towards them even with his immense strength and the Ogres mercilessly attacking him without any explanation, she was also the first to judge that Rimuru had no relation with their assailant and stopped her brother before they fought to the death.
After the unnamed Benimaru decided to serve Rimuru and they were all about to be named, she was yet again the first to stop Rimuru from doing so due to the huge risks that came along with it. Despite her effort, however, this time, they were named anyway as Rimuru was ignorant of the fact that naming higher ranking monsters depletes significantly higher Magicules from the namer with a high risk of permanently losing a portion of the Magicules. Even so, things turned out well and Rimuru fully recovered from his sleep mode within three days without any permanent Magicule loss, by which time all six of them evolved into Kijin.
Shuna is very good at cooking, cleaning, and weaving, which is exactly what she utilised to be of use to Rimuru as his subordinate. She acquired the Unique skills Analyst and Manufacturer which complement and optimise her already existing abilities, helping her become one of the key figures in Rimuru's future country's Department of Production. Alongside her, works the three dwarf brothers, Garm, Dord, and Myrd, and also Haruna and other Goblinas. It was because of her and Kurobe that Rimuru's village was able to acquire exceedingly better garments and armour before their battle against the Orc Lord.
A Demon Lord's Awakening Arc[]
During the battle against Falmuth's army, she works with Mjurran to create a force field to counter the anti-magic force field that was created by the army.
The Octagram Soars Arc[]
In the confrontation against Clayman, Shuna, Hakuro and Souei journeyed to the Puppet Kingdom of Justin, Clayman's domain; while Benimaru and the Beastketeers handle the main forces in Milim's domain. They encounter undead led by a wight named Adalmann, who was cursed to guard the land by Clayman's boss. Seeing Adalmann wears the remains of a priest's robes, Shuna shows him that even monsters can wield holy magic; demonstrating by creating a barrier for them to fight in. Adalmann is impressed, asking for the god she worships; Shuna explains her magic is a manifestation of her great respect for someone. As Shuna's magic purifies the land, only the binding curse breaks. Adalmann, wishing to serve Shuna's master, pledges his and the undead army's loyalty to Rimuru. Shuna internally bemoans Adalmann is just like Diablo - fanatic.
Scarlet Bond Arc[]
She is among the people who accompanied Rimuru to Raja to stop the crimes of the villainous Lucua.
Conflict Between Saints and Monsters Arc[]
She helped Rimuru and his other subordinates deal with an attack by the Seven Luminaries, although she didn't take part in the battle herself.
Territory Seizure Arc[]
She helped establish alliances between the tribes of the Jura Forest. At one point, she stops Milim and Ramiris's bickering, threatening to not give them any snacks if they keep fighting.
Opening of the Monster City Arc[]
She takes part in Tempest's festival and gives a lecture to Middray when he criticizes her cooking. She and Shion later take part in a concert performance.