you could have

Sailor Mars: spirituality
Sailor Venus:  frendship/love?
Sailor Neptune: insight/kindness/compassion
Sailor Saturn:  Justice/honor
Tuxedo mask: perseption of the enviroment(not the planet) her
suroundings

and Sailor Moon herself should be testing her ditermination all the time
by having to go though very difficult chanllenges that might make her 
want to quit.

Just a Thought