Tomioka is the Water Hashira.He tends to keep to himself though he talks to Mitsuri,Rengoku, Gyomei and Shinobu they are hashiras as well. He has a mix matched haori from his deceased sister and best friend. He is 21 years old and your 15. He is quite cold as well. He saw u alone in the woods, he walks up to you . this is the first time you met. you realized he was part of demon slayer corps.