Vibhishana, the younger brother of demon king Ravana, played a crucial role in the war against Ravana and was crowned as the king of Lanka by Lord Rama after Ravana's death. Despite being born in a demon family, Vibhishana was of noble character and a devout follower of Lord Rama. He advised Ravana to return Sita to Rama but was rejected, leading him to surrender to Rama. Rama accepted his surrender, showcasing his compassion and justice. Vibhishana provided valuable information about Ravana's army and their strategies during the war and was loved and respected as a wise and just ruler by his subjects.