Webgiyu tomioka (冨岡 義勇 tomioka giyu) is a demon slayer part of the demon slayer corps.
He uses the breath of water (水の呼吸 mizu no kokyu) and is a former disciple.
Tomioka giyuu gaiden (鬼滅の刃 冨岡義勇 外伝);
Shortly after his encounter with tanjirou kamado, the water hashira giyuu tomioka embarks.
—stories of water and flame.
Giyu heads north to an area where a band of hunters was killed.
He and the insect hashira meet.
Webso my best guess is that kyojurou became a pillar around 15 or 16 years old.
He maintains a calm and emotionless façade,.
Webrengoku is the flame hashira, filling the permanent role in the group opposite of giyu, the water hashira.
Rengoku took over the role after his father, the previous flame hashira,.