Shuna

Shuna (朱菜) is one of the third group of subordinates to be named by Rimuru, evolving her from an Ogre to a Kijin. She was originally the princess of the Ogre tribe and even though she had the talent for using Magic, she was a sheltered girl, but quickly got along with the Goblinas. Shuna lives in the Capital city of the Jura Tempest Federation: Rimuru City. The daughter of the late ogre chieftain and Benimaru's younger sister, which is why she's nicknamed "Oni Princess" by Rimuru. Very skilled and knowledgeable in domestic matters, she essentially becomes Rimuru's chief economic advisor together with Rigurd.

Ogre
In her Ogre stage, Shuna was a petite girl with the appearance of a 13-14-year-old Human girl with the exception of her two large porcelain horns protruding from her forehead.

She has long, wavy, pink hair, coupled with large hot-pink eyes under very light, barely existing eyebrows. She wore a simple pink kimono, covered by a similarly simple white robe that covered her arms in excess. She also had a thin, low-ponytail that was tied using a single small white ribbon.

Her fair skin has a slightly pink tint alongside a couple of tear-like face markings similar to Benimaru, supposedly, to go along with her pink colour scheme, with the addition of two fangs that are long enough to slightly protrude out her lips to add to the "ferocious" theme of the Ogres.

Kijin
After evolution, she took on the appearance akin to a 16-year-old human girl with a height of 155 centimetres, looking more refined and beautiful compared to her former cute self. Her horns also became narrower as with all Ogre to Kijin evolutions.

The slight pink tint on her skin is gone, as well as the face markings, and fangs that are small to be only visible when she speaks.

Excelling at weaving, she made herself a new white kimono with simple but graceful red embroidery and red kimono skirt that's held in place with a red ribbon, causing Shuna to be mistaken for a miko (巫女).

Personality
Shuna is a gentle and forgiving girl with keen senses. Being raised as a princess she also has a refined and graceful personality. Rimuru tends to rely on her regal disposition when it comes to diplomacy with the leaders of other nations.

In her introduction, Shuna seemed to be a shy and fearful girl, staying behind Benimaru and Hakurou while they fought Rimuru. But after they realized he wasn't the responsible of the attack and destruction of their village and allied him, Shuna quickly adapted to their new home and developted a good relationship with its inhabitants, demonstrating that she possesses good social skills.

Shuna is also very compassionate and empathetic. After Rimuru learned about all the victims in the attack made by Kingdom of Falmuth, including Shion and Gobzo's deaths and felt guilty about that tragedy, she approached, gave him a hug and her complete support, telling him that if he needs anything she'll be there for him.

She is at that age where she is happy to be depended on, hence since she was always sheltered as a little girl in the Ogre tribe, she's incredibly happy and content with her current position under Rimuru. Even a bit of responsibility seems to make her happy.

Even so, she is not to be underestimated as she can get incredibly competitive in certain areas too, such as, being appointed as Rimuru's close aide and taking care of him personally. The will to do so is so much that Shuna and Shion unknowingly pull on Rimuru to the point of tearing him in half. Just like Shion, she uses every chance to cuddle with Rimuru's blob form. Shuna shows off her femininity by showing her skill in weaving silk on a loom. Shuna is made responsible for clothing everyone in their fledgling village and had already woven several rolls of silk.

Trivia

 * Her dub voice; Tia Ballard, also played the voice of Zero Two from "Darling in the Franxx" who has a similar appearance of a young girl with sakura pink hair and two oni-like horns! This may be why she was chosen for this role.
 * Interestingly enough Ballard doesn't voice Shuna as softly in the second half of season 2; likely reflecting Shuna's maturity.
 * Since her introduction, she has been shown to be a sheltered young girl to a girl who specialized in silk production, special events and even a public speaker. Her titles include "Ogre Princess" and "Tempest Shrine Maiden" to show her naturally becoming a woman who can fill many roles in Tempest.
 * Rimuru tends to rely on Shuna for anything "Royal", "Noble" or "Distinguished", since the Slime is from modern world where many countries have had gone centuries without a monarchy or a noble class system.
 * In spin-off series and in the Main Series it has been shown that Shuna has a "Fierce" Anger fueled smile that makes many male characters who have earned her ire sweat and panic around her. Most Notably her Older Brother Benimaru and Rimuru.
 * Tends to get into "Tug-o-Slime" wars with Shion trying to vie for Rimuru's attention, much to his exasperation. Aside from that, she also alongside Shion; likes to dress Rimuru up in female or male clothing, where as Shion favors Masculine clothing more, Shuna favors Feminine Clothing.
 * Despite being considered the weakest of the Kijin that serve Rimuru (even Kurobe), her magical abilities are far superior to all the Kijin combined, making her a "Special A Ranked" Monster.