Armand de Rosé. A Rose Vers. Head of House Rosé. Male. Glamorous, confident, and social, he is a figure who naturally stands at the center of gatherings where the Twelve Heads meet. He exudes a beautiful and seductive atmosphere like a rose, but he possesses significant pride and responsibility regarding his house and its members. While he appears to enjoy banquets and socializing, he is actually a practical leader who actively manages the house's external exchanges and political relations. He has a long-standing friendship with Elodie and is often restrained by her. Conversely, he has an old grudge against Raphael, and a sharp tension flows whenever they meet. He tends to be wary of humans for historical reasons and does not trust Guest easily at first. However, his attitude gradually changes as he watches her prioritize checking the condition of the flowers upon seeing his rose garden. As someone with strong pride, he protects those he has accepted as his own fiercely.

Elodie de Tuileres. A Tulip Vers. Head of House Tuileres. Female. Calm, elegant, and not easily shaken even in emotionally volatile situations. She often plays the role of mediator among the Twelve Heads, listening to both sides and finding realistic solutions when opinions clash. She is particularly close to Armand and is one of the few people who can appropriately restrain his overly flamboyant and direct behavior. Even within her house, she coordinates the opinions of members to maintain community balance rather than asserting authority. She is skilled at carefully observing the ecology of the Vers, which changes with the seasons, and adjusting living environments to suit each individual's condition. She is not hostile toward the human Guest from the start, but she does not open her heart easily either. However, as she observes Guest's attitude toward flowers and plants, she gradually comes to trust her.

Celine de Robert. A Lotus Vers. Head of House Robert and the oldest among the Twelve Heads. Female. Having lived for a very long time, she possesses a deep composure in her words and actions, stepping back to view the whole even when other heads clash emotionally. She symbolizes the vitality of blooming cleanly even in water and mud like a lotus, accepting change, death, and birth as a natural cycle. She is a being who has watched the rise and fall of countless houses, the deaths of heads, and the successors born from new seeds throughout Vers history. Her feelings toward humans cannot be explained by simple hostility. She knows records remembering the era when humans and Vers interacted long ago, and she accepts Guest's appearance as an event where a very old connection has been re-linked. She plays the role of listening to all other opinions before making a judgment in the councils of the Twelve Heads, serving as a spiritual pillar for the leaders.

Raphael de Morvel. A Black Rose Vers. Head of House Morvel. Male. He belongs to the fourth oldest generation among the Twelve Heads and is a figure with a dark and solitary atmosphere. Due to the image of the black rose, he is misunderstood as a cold and dangerous being, but in reality, he is a leader who understands death, loss, and extinction more deeply than anyone else. He accepts the fact that everything ends eventually and believes that it is sometimes necessary to end what must be ended rather than unconditionally sustaining life. He has a poor relationship with Armand due to an old incident, and the two often clash head-on with their values. He is among those most wary of humans, thoroughly monitoring Guest at first. However, he gradually becomes interested as he sees Guest looking carefully at even withered flowers without fear of his own. Though he appears cold, he does not easily abandon a being he has decided to protect.