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Commission by DragonChaser123, and a big thanks to Silver Quill for allowing me to make use of an old design from his A Princess’ Tears comic series.
 

 
Name: Life Line  
Family: N/A  
Sex: Female  
Age: 24  
Race: Unicorn  
Body Type: Average  
Cutie mark: White rod Rod of Asclepius inside a purple and gold heart  
Special Talent: Healing  
Occupation: Royal Guard (Militia, Sergeant, Field medic)  
Nickname(s): Lifey Wifey, Empty Hoof, Double L  
Residence: Canterlot  
Voice Actor: Rachel Bloom (Barbara Gordon, Batman vs Teenage Mutant Ninja Turtles)
 
Background/Personality: Born to a wealthy pair of ponies from the Canterlort aristocracy, Life Line enjoyed all the finest comforts growing up, endlessly pampered and doted on by her parents. The constant attention, as well as the many high class socials and gatherings she was bought to from the time she was little grew to be a bit overwhelming for her, giving her some distaste for her parents and the upper crust lifestyle of the pretentious Canterlot elite in general.
 
Eighteen years ago, a young Life Line was playing in her yard when there was an airship accident not farm from Canterlot. She could see the bright blast of light and burning fire from the city. Later commotion drew the curious young foal to go and see what was going on, taking to the streets. There she witnessed dozens of gravely injured and dying ponies being carted to the the hospital. The image of the pain, suffering, and death she saw that night nearly traumatized the young unicorn. A fit of hyperventilating was only calmed by Princess Celestia herself, who had arrived on scene along with the Royal Guard to help. The princess’s poise and the actions undertaken by the guards to assist in the tragedy would have a lasting impression on Life Line.
 
Since then, Life Line expressed a desire to become part of the Royal Guard. To assist ponies and Equestria as she had seen. She would later enroll in Celestia’s School for Gifted Unicorns, where she discovered her special talent for healing magic. Once she was old enough after graduating, she applied for a position in the Royal Guard, much to the dismay of her parents.
 
In the years since she’s become a respected member of the Royal Guard, specializing as a field medic.