Personally, there is nothing I love more than my OCs. I love fleshing out their personalities, desires, and worlds. Whether its an OC from a universe of your own making, or an OC for your favorite show, go crazy stupid about them in my comments please.
My favorite OC right now is named Varin. He was mistakenly taken in by an all female high elf society when he was just a baby, and praised as the greatest prospect to join the high courts. After realizing he's a man, he tells the elder council and is barred from the society. He lost many of the deities he worshiped, and had to discover the world alone. In the end he is guided by the primordial goddess of balance, who has him bring his love interest (a veteran human who cheated death) to her last true altar, and kills her.
After that he spirals, as he gives up his religion. Without religion to guide him, he feels he lost direction in his life. He's resentful of the goddess who betrayed his trust, and lives his life in opposition. He blames her for all she did.
His story would end with the full circle. The society he was raised in was made by a worshiper of the primordial goddess who wished to escape war. The law barring men was placed after the hunger for power hurt the society, with men at the center of it. In the end, Varin would destroy those values. His anger towards the primordial goddess, and betrayal at being removed from his home, would lead to him destroying the society, ruining and proving it's purpose.
Another OC I love is Amadeus. She is a daughter of dionysus in the PJO world. She remained unclaimed and unaware of her status for years, as she was adopted by a rich family. She is in a dance academy with a girl named Priha (who she is in love with). Ama's parents are strict, and have high expectations. At a party she is told to mingle with Rachael Dare, and that's when she recieves a prophecy. She thinks Rachael is just weird, and goes on about her day.
As she and Priha are on a private flight to their university, the plane goes down. Priha tells Amadeus everything will be okay, before pressing a kiss to her lips. The plane hits the ground. Amadeus is barely conscious as she realizes there's monsters, and the only thing she has is her clothes and Priha's lip gloss. Priha is no where to be found. Something tells her to open the lip gloss, and when she does it turns into a mace. She struggles to use the weapon due to her lack of muscle, but is able to drag herself to camp half-blood.
That is where she learns Priha was a daughter of Aphrodite, which makes sense in Amadeus's mind. She is immediately approached by Rachael, who repeats the prophecy from the event. They have a quest, Rachael and Amadeus, and perhaps another character. There is darkness looming, and Amadeus wonders how her parents will react, if Priha's okay, and why she 's hunting monsters when she should be at Yale...
Not to give too much away, but I really want her story to be one of metamorphoses. I believe Amadeus would start as a skinny, straight-ironed blonde-hair, blue-eyed, proper clothed girl and turn into a woman with soft edges, stomach pudge, naturally wavy hair dyed brown, who wears sports tops and sweatpants. She is happier in the end, despite all the bruises it took the reach it.