Shadow

Story
Shadow was the Purple Wolf-themed Ranger. His personality is cold, busy, loner and hardworking. He never joins the Rangers but he helps them to fight against Venom and his foot soldiers. Shadow always works on his own as well. Shadow appears to rescue the Rangers from harm and monsters, Sylvester says "thanks" to him but he says don't thank him. Besides he doesn't exactly care interacting with the other Rangers.