Gira husty the demon king of all riders

i am rewriting the story that gira have the power of all riders as when he was a child and he was totured by the burgnarok as he was freed and one day make the burgnarok payed as gira has a older sister who is half burgnarok and was experimented on as gira takes care of her as she was frightened a bit and takes her somewhere where no one can harm herr