Claire's goals are all about her feelings, while Luna's are anything but.

Claire is the only person who doesn't judge Luna nor does she try to change Luna. Claire doesn't pressure her.

Cassiopeia is the reason behind the name Ghost Girl Phantasma. Meant to be a ghost, her entire narrative switched.

In the current version her nature is vague, open for interpretation and supporting both theories.

 

This drawing represents one of the concepts behind her death, missing an arm. The idea of her dying from a stray bullet meant to hit her lover was considered before scrapping everything.