Just decided to give you a little hints on who are the Hashiras.
The Moon Hashira Michikatsu Tsugikuni
The Destruction Hashira Hakuji Soyama
The Ice Hashira Douma Tōketsu
The Music Hashira Nakime Otogawa
The Dragon Hashira Zohakuten Usotsuki
(Hantengu is their grandfather who took care of them)
The Lightning Hashira Sekido Usotsuki
The Night Hashira Aizetsu Usotsuki
The Light Hashira Urogi Usotsuki
The Wind Hashira Karaku Usotsuki
The Shark Hashira Gyokko Sakana
(His breathing style is supposed to be fish but there's nothing in the internet so I gave the shark instead)
The Ribbon Hashira & Blood Hashira Ume & Gyutaro Shabana
(Gyutaro has three breathings which are blood,dark blood and poison breathing and he also wields a pair of sickles)
The Water Hashira Sabito Urokodaki
You know who they are so I won't be introducing them but I'll give you their standing roles as a family.
Zumichi is the eldest,Ariki the second eldest and Rui the youngest.
So that's it and stay tuned for the other bio cause you'll be meeting the Lowermoons next.
(P.S I tried to find other pictures but found nothing so please bear with me)