: Given Iris's association with the rainbow, exploring the symbolic and practical implications of the rainbow in this world could add depth. The rainbow might serve as a source of power, a guide for Iris, or a symbol of hope.
: Creatures that swallow her "cards" (her willpower and memories) and turn them into further threats.
The title "Iris in the Labyrinth of Demons" likely refers to Iris and the Giant
: The involvement of gods or higher powers could add another layer to the story. Are they directly involved in Iris's journey, or does she act independently? The consequences of divine intervention or neglect could influence the narrative.