Mereoleona

Mereoleona is a woman with blue eyes and long, wavy vermilion colored hair. Like her brothers, she has red markings around her eyes, and like Leopold, she has one sharp, pronounced canine tooth.

Mereoleona's attire consists of a white tunic, covered by a long, dark blue shirt with long sleeves and high collar. The shirt is decorated with fabric with vertical stripes design on its edges and collar and along the sleeves, which she keeps rolled up to her elbows. In order to keep the shirt together, she wears a purple sash around her waist. She wears white trousers. On top of her attire, she wears a long red cape.

As a member of the Crimson Lion squad, Mereoleona wears the squad's signature robe that only covers her torso. The robe has intricate designs at the lower front edge and is complemented with a scarf. A pair of ropes are protruding from between the scarf and the robe at the front and a stone is decorating each end. Lastly, the squad's insignia is located at the center back of the robe.

Six months after the elves' attack, Mereoleona has cut her hair short.

Loud, brash, fearsome, and powerful, Mereoleona is a powerhouse with a short temper to match. She is often aggressive in her demeanour towards most people, giving her an intimidating figure. Rarely one to stand on ceremony, she is more interested in actions and practice instead of words and patience. Despite her direct personality, Mereoleona shows a deep understanding in how to motivate others, even those she had just met.[8] She respects anyone who is willing to become stronger and, unlike most nobles, does not judge others based off their upbringings or lineage, much like her brothers.

Mereoleona dislikes the Royal Capital and often hates its political schemes. To remove the headache, she left to battle on her own and explore the remote areas of the Clover Kingdom and instead spends most of the year out in the wilderness, hunting wild animals and basking in natural mana which has given her familiarity with potent training spots. Despite her objections to becoming a captain herself, she takes over when Fuegoleon Vermillion is incapacitated, and leads the Royal Knights in an attack on the Eye of the Midnight Sun, hoping to avenge her brother.

Enthusiasm and aggression along with a thirst for combat has given Mereoleona an aura of terror and awe. Some of the strongest characters in the series are terrified when she shows up unannounced, thinking she is there to pick a fight. Yami Sukehiro tried to run away the second he learned she was in Black Bulls base and abandon his squad to her wrath; Noelle Silva's haughty attitude evaporates on the spot when she sees her; and Zora Ideale described Mereoleona as a wild and indominable beast. What Mereoleona longs for most are strong opponents that she can go all out against. Her thirst for battle is so extreme, her face contorts into a demon like smile and her power explodes the more cornered and outmatched she is, much to the chagrin and terror of her opponents. This combined with her unwavering determination has earned her the title of the "Uncrowned Undefeated Lioness".

Mereoleona is shown to have a lack of modesty or natural view of nudity, as she did not hesitate to order everyone (both men and women) to strip down and bathe together in the hot spring, and smiled at the men's "enthusiasm" when she heard them trying to peek at the women.