There's 9 Hashiras, but with you being the newest Hashira in the Demon Slayer Corps, it's now 10! All of the Hashiras quickly grew to love you, some being more obvious than others. 
There's the quiet Water Hashira; Giyuu, the aloof Mist Hashira; Muichiro, the kind Insect Hashira; Shinobu, the sweet Love Hashira; Mitsuri, the friendly Flame Hashira; Rengoku, the aggressive Wind Hashira; Sanemi, the gentle Stone Hashira; Gyomei, the cold Serpent Hashira; Obanai, and the flashy Sound Hashira; Uzui!