Hiroshimo Yumiko and Seimari Reiko

Reiko is a boy with an overly feminine appearance. 15-16 years old, a year older than Yumi. His birthday is November 27th. Blood type III positive. He is 172 cm tall and weighs 60 kg. His favorite food is blueberries.
Uses Ice Breathing. Yumiko didn't create Ice Breathing alone. Well, her version of it. However, Reiko was simultaneously creating Ice Breathing, unaware that Yumi was doing the same. Their versions turned out to be very different. Working together, they edited the breaths, making them almost identical, but Yumi's was softer, while Reiko's was quite sharp, reminiscent of Wind Breathing. This is due to the difference in their body types. Ice Breathing simulates ice cuts, freezing, snowstorms, cold winds, icicles, and frostbite. Reiko is incredibly kind, a little silly, and ate Yumi's stash. He and Yumi were childhood friends. Despite his aristocratic background, his father was incredibly fond of fishing, just like Yumi's father. But he suffered the same fate as Yumi's father. They were mauled by wolves in the forest. Reiko had a younger sister named Manoma, five years younger than him. Her birthday is March 21st. Their mother, an incredibly kind woman, is 30 years older than Reiko. He also has an aunt who is a year younger than his mother, and her aunt has a daughter who is two years older than Reiko. None of these four died; Reiko simply ran away from home and joined the fighter jets.
TEMPORARY MOMENTS!!!
loss of father - 4 years,
running away from home - 9-10 years old,
showed up with Yumi to Urokodaki - 9-10 years old,
passed the final selection - 12 years 8 months,
became hashira - 12 years 10 months (13 years).

Interesting facts:
He is a man of disaster with incredible luck.
He loves botany and grows plants.
Trying to understand poisons.
He loves to eat.
He loves drawing.
The Seimari clan, like the Hiroshimo clan, was one of the most influential in the Japanese Empire.
Seimari Reiko is written as 聖真理 怜子 in Chinese/Japanese, which means Holy Truth (surname) + Pity the Child (name).

About Yumiko:
Yumiko (or simply Yumi). A girl of about 15 years old (she's actually 15), height 176 cm, weight approximately 64 kg, blood type B negative, birthday April 18th, favorite foods: mochi (regardless of flavor), warm soba, and peaches.
The hair is just below the shoulders, sometimes gathered into a bun or ponytail, and has light blue/sky blue tips.
Backstory: Yumi's father was a fisherman and often disappeared at night while fishing, but he always returned. One day, he didn't return. A few days later, her father's body was found in the forest; he had been mauled by a pack of wolves on his way home. Yumi, her older brother, Atahiko, and her mother were left alone, living as if nothing had happened. One day, Yumi and her friends were allowed to hang out until nightfall. When she returned home, she saw her mother being devoured by the 5th Upper Moon. Her brother was unconscious. Yumi was terrified and ran to the neighboring houses to ask for help. When a couple of adults arrived, the demon was gone. Only bones remained of her mother, and her brother had become a demon, fortunately, he had not yet fully formed and was quickly killed. Yumi has a snowflake-shaped hair clip from her mother. As a result, Yumi met Sabito (yes, they know each other), by that time Makomo was still alive, Giyu and Sabito were studying with Urokodaki, Sabito took Yumi with him and brought her to Urokodaki, she invented the breath of ice based on the breath of water, passed the final selection but was just as depressed as Giyu after the loss of Sabito and Makomo, after diligent training she became a Hashira after 6 months.
TIME PERIODS!!! (important!)
Lost my father: 3 years.
Lost my brother and mother: 7 years old
Came to the lesson: 8-9 years old.
Passed the final selection: 11 and 2 months.
Hashir became 11 and 10 months old (literally 12 years old).
Interesting facts!!:

1. As a child, when Yumi found some flowers unknown to her, she ate their petals, most of all she liked the petals of lotus, spider lily and wisteria,
   She described them this way:
   Lotus: It tastes sweet, a little bitter, but very tasty!
   Spider Lily: It's bitter, but my mom said it's good to drink in tea or just on its own!
   Wisteria: After using it, my throat hurt too! It's like tangerine peel.