A character built on a single, tightly-held premise - and what an originality check found underneath it.
Whether the check would recognise that Willow's nature is a structural, physical limitation rather than a personality trait or a curse - and whether the gap would read as a response to this specific text rather than a template applied to anything.
Closest matches
The originality gap
Every trait derives from the same unbroken rule. The logic is consistent, which is a strength, but nothing about her contradicts or complicates the root metaphor - so she reads as an extended metaphor rather than a person with an interior.
The pivot
Give her one deliberate choice that cuts against her own physics, rather than another trait that illustrates it again.
Verdict
Roughly 70% recognisable as written - the gap above is what closes it.
The matches span three different media - comics, film, and a genre convention rather than a single title. That matters: a check that only names the most famous possible comparison is pattern-matching on fame, not on structure.
The gap is also not "make it more unique." It identifies a specific structural property - every trait reducing to one root metaphor - and gives an action that would change that property. That is the difference between criticism and a usable note.