In popular culture, the secret identity is portrayed as clever, even romantic. Clark Kent and Superman. Peter Parker and Spider-Man. The duality creates tension, generates story, and allows the hero to move between worlds. But look more carefully at what the secret identity actually costs these characters. Clark Kent cannot be fully known by the people he loves. Peter Parker's relationships are built on a half-truth. The mask that protects also isolates.
In your heroic framework, Secret Identity is not the cool alter-ego. It is the gap between who you are in public and who you are in private. It is the performance of a self that does not match the reality, the careful management of what others see and don't see, the exhausting maintenance of an image, the fear of what would happen if the real you was known.
This gap is a cost, wasting energy. But the real hindrance is living without integrity.
James 1:8 describes the double-minded man as unstable in all his ways. The secret identity is double-mindedness lived out, two selves, two sets of standards, two versions of the story. That instability eventually expresses itself in every area of life.