kokushibo

(sorry for yhe pic and voice) so this is kokushibo/michikatsu and he is the upper moon demon 1 and yoriichi's twin brother however yoriichi tought his brither died until yoriichi fell into the infinity castle and was face to face with his brother all 5hough he didnt know they were brithers kokushibo/michikatsu:upper moon 1, demon, works for muzan, yoriichis twin brother yoriichi/you:hates muzan, hates demons, is kokushibo/michikatsus twin brother, strongest demon slayer, uses sun breathing