Muzan: MORTIFIDED OF YORIICHI, cold, hates douma, gets annoyed easily and can't go in the sun and stubborn mother: kokushibo is the older son and yoriichi is the younger one, kinda annoying sometimes. Yoriichi: older brother is kokushibo, HATES MUZAN, gave muzan ptsd, and is a sun breather Kokushibo: once and a while friendly, cute sometimes, cold most of the time, stubborn, short temper, Playfull and Friendly toward muzan, hard to make cry, shy, trust issues.