Name: Castor  
Nickname(s): Cassy(Twi only), Cas(Friends), Little Dash(Dash only)  
Age: 19  
Gender: Male  
Height: Smaller than the average stallion  
Special Talent/Occupation: Tattooing/Tattoo Artist  
Cutie Mark: Tattoo pen and heart with wings
 
Parents: Twilight Sparkle and Rainbow Dash(Divorced and sharing custody) + Tempest Shadow(Step-mother) (Twi can cast a spell to change a pony’s sex)  
Half-Sibling: Dusk Sky (Hates her guts)  
Friends: Jami, Custard and Amilion(Only pony/draconequus to befriend both Castor and Dusk Sky)  
Crush: Cameo Apple
 
Personality  
Castor is an overall upset and self-deprecating guy. He blames himself for his parents’ divorce and now hates his prince status since he is treated differently. He hates the standards that everyone has for a prince. They’re supposed to be nice, they’re supposed to be caring, this and that. But, Castor is the opposite. He’s groggy, he hates mostly everyone and is mean. He’s only nice to Twilight and Rainbow Dash and his friends. However, he hates Tempest and Dusk Sky, his step mom and half sister. But, what they don’t know is that there’s a darker side to him. A side filled with jealousy, envy and anger. A side that will soon make him into a villain.
 
Relationships  
Twilight Sparkle: His dear mother. He loves her with all his heart and still cares for her, but is spiteful that she chose Tempest Shadow over Rainbow Dash, his mom. They get along great and Twilight was always supportive of his designs as a kid and a teenager, supporting him of becoming a tattoo artist.
 
Rainbow Dash: His wonderbolt mom. He loves her and prefers to stay with her in her Cloudominium. He barely every has a fight with her and the rainbow haired mare was always by his side. When he first flew, his first design, his first customer, she was right there to encourage him after the job.
 
Tempest Shadow: The pony he claims tore his life apart. The mare that is now married to Twilight Sparkle and a mother to the mare that he targets. He hates Tempest Shadow with a passion and would love to see her drop out of his life even if he has to do it himself.
 
Amillion: His best friend since flying. This little noodle has been his friend for nearly 18 years and has always been by his side. He adores the guy a lot.
 
Jami: Another best friend of his for 13 years and shares his bitterness toward the world. For being teased as a kid like Jami did, they bonded over this and had fun making fun of their bullies behind their backs.
 
Custard: A little friend he shows sympathy towards because of his hardship with his sister. He hates hearing his sister fight with Custard and steps in 9/10 of the times.
 
Cameo Apple: Let’s just say he’s the apple of his eye. He loves this flirty little bastard. He doesn’t care how vulgar he is. He just for some reason loves him. This started when Cameo confronted Castor’s bullies.
 
Dusk Sky: One pony that he may hate more than Tempest. He constantly has fights with his half sister all the time. She’s probably the first person he would consider getting rid of.
 
Umbra: The one obstacle in the way of becoming a villain. Umbra discourages Solar and Castor from becoming villains and tries to point out the mistake they would make. But, it doesn’t get through.
 
Solar Eclipse: His partner in crime. He enjoys Solar’s company and honestly spends a lot of time with him during royal meetings between the princesses and Queen Celestia.