RWBY: The Dragon Huntsman Rise

His name is Darco Eragon who has the power of Dark Dragon and Elements of Dragon souls. He announced his siblings to travel through different worlds to protect and change the world. Then they agree to what he said. They went through the portals and said goodbye to them until we meet again.

Then Darco arrived in the World of Remnant and he heard a crying little girl named Ruby Rose who is lost in the woods and some Beowolf are going to attack her. Her dream is to become a huntress. Darco manages to save, help and take care of the girl. But Darco is going to protect the girl and the world from now on as a guardian, friends and family or as a big brother. Both Darco and Ruby bounded together as siblings they will defeat bad guys and kill Grimm at all costs.

PS: I don't own RWBY from RoosterTeeth.