Maybe it could have four abilities based on the acts of Richard Wagner's opera:

- The Rhinegold

- The Valkyrie

- Siegfried

- Twilight of the Gods

Four unique powers but they can't be used out of sequence; it must be 1, 2, 3, 4, 1, 2, 3, 4. A musical operatic character would be cool or maybe someone that contrasts with music but still works to a beat, like an assembly line factory worker with the dream of becoming an opera singer. He could start the story overweight and get in shape. That would be an amazing arc, haha.