This is an OC I’ve had for quite a while already.  
Some info about it:
 
Name: Lithium Shepherd (Lyth)  
Age: Around 25  
Birthday: November 17th  
Residence: A property near Ponyville; takes care of it along her father.  
Cutie Mark: A black cane with whitened reflections.
 
Personality: Simply put, Lithium is described as “an optimistic nihilist”. In a general way, she’s assumed the idea that “nothing matters”/“everything is meaningless” is inevitable, but rather than using it as an excuse to complain, Lithium has conserved her resilience and has used that premise to keep doing things. In some way, it could be said Lithium managed to relearn said premise “backwards” to put it to her advantage.