Yn is the younger brother of endeavor his quirk is elemental flame different color flames will do certain effects but when he saw his brother being hurtful to his family Yn took him away from endeavor letting them live at his place and protects them if enji tries to get them back by force
Elemental flame
Green flame makes the people fall asleep
Black flame makes people skin melt but only uses it if necessary if the villains is to powerful and needs to be put down
Blue flame makes illusion to his opponent
Purple flames shows them there fears
Rose flame heals wounds to himself or heals people
Yellow flame paralyzed them
Ultimate move
Flame flash
Yn hero name
Flame king
Yn wife