Tomioka Giyuu

— They are always being Demon Slayers around. And their job is protecting humans from demons but in a secret, because if people find out demons exist, they can he in teribble depression. That's why. And also some of Demon Slayers are more powerful that able to took down demons more calmly and easily than other slayers... They named 'Hashira'. There is many of Demon Slayers but only 9 of them are Hashira.

1- Himejima Gyomei
2- Shinugzawa Sanemi
3- Tokito Muichirou
4- Tomioka Giyuu
5- Rengoku Kyoujiro
6- Kanroji Mitsuri
7- Iguro Obanai
8- Tengen Uzui
9- Kocho Shinobu

— Demons are maneater creatures. They all are past humans actually but they are agaisnt humanity now. They getting stronger by eating humans. Their lord has created two moon things, Lower Moons and Upper Moons. Lowermoons are more powerful ones from normal Demon Slayers. And Uppermoons are stronger than Hashiras usually.

— Demons has weakness' towards two things:
1- Sun light,
2- Nichirin blades (slayer katanas), that's the reason of demons couldn't attack humans at day. They shows themself only at night.

— Demon lord is around thousand years in world. His name is KIBUTSUJI MUZAN. Muzan has given his blood to his demons. So he can kill them, read their mind, know their location, increase their strenght, giving his own location, manipulate them and more. He does this so easily... He is an angry person. He actually doesn't care about his demons. But Upper Rank-1 is Muzan's right-hand demon. If Muzan decide to go somewhere, he takes Uppermoon 1 with him always. He has created Uppermoons and Lowermoons. Their rank shows in their eyes. Lowermoons ranks showing in left eye with only number. Uppermoons ranks shows two eyes, right one is 'Up' writed and left one is has number. They both up and lower moons are created by 6 to 6 demons. All of them together is getting called 'Twelve Kizuki'.

•(from strongest to weakest)•
Upper1: Kokushibo
Upper2: Douma
Upper3: Akaza
Upper4: Nakime & Hantengu
Upper5: Gyokko
Upper6: Gyutaro & Daki
•••

— Uppermoons are usually strongest ones even than Hashiras. They are strongest agaisnt other demons and more royal ones to their lord, Kibutsuji.

(from Google)

Like many other characters Giyu is an orphan whose family was killed by Demons. Before the day of his older sister Tsutako’s wedding she sacrifices her life to let Giyu survive, this leads him onto the path to become a Demon Slayer. He becomes Sakonji Urokodaki’s disciple and later holds the position of the Water Pillar. He is one of Tanjiro Kamado’s mentors and a major supporting character of Kimetsu no Yaiba (Demon Slayer). Giyu first appears to save Tanjiro Kamado from his sister Nezuko who had turned into a Demon and was on the verge of eating him. When Nezuko moves to protect his brother from Giyu rather than eating him, Giyu realises that these siblings are unique. Instead of completing his job as a Demon Slayer he decides to guide them to his former mentor Sakonji to show Tanjiro Kamado the path of a Demon Slayer.

Giyu has medium length, messy black hair which is tied into a low ponytail and dark blue eyes. He wears the standard black Demon Slayer's uniform as well as a haori with two different patterns. One solid red colored from his deceased older sister and one geometrically patterned with green, orange, and yellow from Sabito.

Watching Tanjiro and Giyu utilize their Water Breathing techniques is quite a blast, and one can't wait to see how this amazing sword-wielding technique will evolve over time. Keeping this in mind, here are all the forms of Water Breathing and their potential in battle. Water Breathe Style has eleven form.