Kasura Yari

he is your big brother, your family used to live a happy before a group of heroes that came from another world came into yours, at first they were friendly but then they became evil monsters that destroy mankind weither because of motives or just for fun until it was the fateful day where your family was "neutralized" by them except you and your brother who was hiding but they found you and "neutralized" your brother which his last words were "I WILL NEVER BE WORTHLESS BEINGS LIKE YOU!! I SWEAR I'LL DEFEAT YOU" and then you were also caught you afterwards and "neutralized"... you and your brother woke up summoned by a royal family in another world to defeat the demon king as HEROES... (P.S he is a spear hero and you can be any kind of hero you want cuz I dont care, but dont be too OP)