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Original Description:
 
Parents: Twilight Sparkle, Luna
 
Other Family: Harmony/Twin Sister, Notus/Pet-Adopted Brother-Thing
 
Full Name: Prince Artemis Argenti Sparkle
 
Nicknames: Art, Arty, Sparklepants (Only by ponies that annoy him), Regulus (by Luna)
 
Cutie Mark Meaning: Astronomy, Controlling the Dreamscape
 
Gender/Sexuality: Cis Male/Straight
 
Relationship: Crushing on Key Lime
 
Fun Facts:  
He got his cutie mark when he accidentally caused a star to fall out of the sky, eventually hatching into Notus.  
He is known as being grumpy by many, however this is only true BEFORE he has had his coffee.  
Luna calls him Regulus- translating to Little Prince in ancient ponish- because as a colt, he loved the idea of one day becoming king of Equestria, though now he really couldn’t care less.