Karmen moved to Hawkins as soon as she heard that a child like her might be in danger. On her search to find Eleven, she makes new friends, enemies and maybe even love. At the same time she is battling against herself to stop her powers from destroying everyone around her. Will she be able to help save Hawkins from the Upside Down? Steve/OC. Some Billy/OC.

Kali had to suffer through her life with everyone knowing who she was and what her brother had done, but after travelling on the ill fated Oceanic 815, she's just another stranger stranded on a deserted island. She should be focusing on getting off the island, but the mysterious Sawyer keeps grabbing her attention. Is this her second chance or the end? Sawyer/OC

Krissy Crawford, Jack's daughter, is no stranger to the destruction a serial killer leaves in their wake, but love? That is something she isn't prepared for. As feelings grow between herself and Will Graham, she begins to question why she is drawn to the unstable man. Could the mysterious Hannibal Lecter be pulling them both down a dangerous path? Will/OC/Hannibal

Eddie Munson’s best friend, Kayla, had been missing since 1983, forgotten by everyone but Eddie and her crush, Steve Harrington. When she returns almost three years later, traumatised and secretive, Eddie must find a way to save her and the rest of the world. But with Steve’s feelings for her growing, who will Kayla choose? Eddie/OC/Steve

Kami Decker, Chloe's adopted sister, returns to L.A after running away from home when she was a teenager, to find a new set of people in her sister's life. With enough parental issues to rival Lucifer and a violent streak, the Devil can't help but take an interest. Will Lucifer be sent down a new path, or will he lead Kami to ruin? Lucifer/OC. Some Maze/OC

Billy hated Krystal. He hated having another step-sister. He hated having to move to Hawkins because of her. And most of all, he hated how she was the only girl who was able to get under his skin. He couldn't really have feelings for his freak of a step-sister, could he? Billy/OC

More machine than human, Experiment K-80 knows little more than following the orders of her Handler. A difficult history with the Winter Soldier pulls her into a fight for her free will that she never wanted. When Captain America gives her the chance of redemption, will she take it? Starts in TWS. Bucky/OC

Kahlan ventured to Camelot in the search for Mordred after he disappeared on a supply trip, only to find the King's Ward and Emrys had saved his life. After meeting the great sorcerer and Arthur Pendragon, Kahlan finds their destinies have become connected forever. With growing friendship and romance, can she help save any of them? Arthur/OC

The Lord of Light has shown Kiana many things in the flames since she was a child. As a newly appointed Red Priestess, she travels to King's Landing to spread the word of what is to come in the Great War. A growing connection with Jaime Lannister puts her mission in jeopardy, as she has to choose between her faith and those she loves. Jaime/OC. Seasons 1-8, becoming AU.

Kassidy Longbottom didn't have an easy start to life. Traumatised by her parent's cruel fate, she wanted only one thing her whole life. Revenge. As the years go on, she learns this has a heavy price. She could risk losing her twin, Neville and the friends she has gained at Hogwarts. Another boy is facing a similar challenge, will Draco help her or betray her? Draco/OC

Kara lived with Alison's family for a few months before Alison blackmailed her into leaving Rosewood, after Kara started to become more of a problem than a friend. After hearing that Alison's murderer, Ian Thomas, confessed and then committed suicide, she returns to Rosewood, reconnecting with her old friends and old crush Jason and she soon becomes tangled up in A's game. Jason/OC

The Master and Katerina, the Doctor's sister, had always felt a connection between themselves, but what will happen as the years pass by and the Master slowly goes insane? Starts from their childhood on Gallifrey and continues through Series 1 onwards. Master/OC. Some Jack/OC later on.

Katherine arrives in the town of Beacon Hills and soon gets involved in the pack and it's alpha. Starts from around 2x03. Derek Hale/OC