Melanie Vallejo is widely recognized by Power Rangers fans for her role as Madison Rocca, the Blue Mystic Ranger in Power Rangers Mystic Force (2006). Madison, often called "Maddie," was the kind-hearted and thoughtful member of the team, known for her loyalty, compassion, and creativity, particularly her love for videography.

Melanie’s portrayal of Madison brought depth and warmth to the character, making her one of the most relatable Rangers of the Mystic Force team. As the Blue Ranger, she wielded water-based magical powers and fought bravely against the forces of evil, helping to protect both the magical and human worlds.

Her performance in Mystic Force helped solidify the season’s emotional tone, and her character remains a fan favorite for her quiet strength and growth throughout the series.

After Power Rangers, Melanie continued a successful acting career, particularly in Australia, but her role as Madison Rocca remains one of her most celebrated performances among the global Power Rangers fandom.