Logan is the second youngest of the four Kingsley siblings, the older generation anyway, and in the beginning, he was the quiet one, rarely letting himself out of his siblings shadows. His parents were potioneers and both successful in their careers, which allowed enough income to support the family. Though he was quiet, he did love his siblings, often trying to stay as close as possible to his family in the early years, treating those outside of them with distrust and suspicion. As a consequence, Logan didn't have many friends growing up. When he was ten, he had his first instance of magic. He was climbing on a tree, getting to the top, and fell and would most likely have snapped his neck if he had hit the ground. Fortunately, his magic kicked in, teleporting him so that he found himself crashing into his bed instead. After this event did he receive his letter for Hogwarts and, like his older brother, was sorted into Gryffindor.
Growing up, he learnt through broken conversations and hushed voices of the curse that supposedly plagued his family. As he grew older, he became more aware of what was happening and its potential significance. One of his siblings, maybe even him, was to be the leader of the serpents one day. Though he didn't fully believe it, he didn't dismiss it either, and treated it with caution and most of the time, he tried to never let it cloud his judgement of his siblings and their potential future. Though, at times, he did let himself think of it, trying to guess which one of them was it. Eventually, he did deduce it was either him or his older sister. Though these thoughts were more humouring himself than anything.
At school, he blossomed. He wasn't the shy, curious, exclusive child that he was growing up but found himself surrounded by friends. Due to this, he found himself less reliant on his family. However, he found himself always in the shadows of his siblings and sometimes wondered if his new found popularity was because of his relation to the Gryffindor quidditch captain and his infamous Slytherin sister. However, he didn't really care, enjoying the new friendships and opportunities around him. Academically, he wasn't the best, but he wasn't the worst either, and his marks were average. However, by the end of his first year, it was clear that he and his family were moving to America. Though at the time he didn't know why and was angry at the circumstances, as he didn't want to leave since he finally found somewhere where he felt like he belonged. As he grew older, though, he realised that it was because of his sister. Artemisia had gotten in contact with their estranged aunt and they had found letters discussing plans for Artemisia to run away.
Ilvermorny. At school, he was sorted into Thunderbird. Despite his wariness to the move, he found himself fitting into the place remarkably well. Unlike his siblings, who both enjoyed the American version of quidditch, Logan preferred defence against the dark arts and was often found trying to improve his magic for battle. However, though he had a large group of friends, he also gained enemies and often gotten into fights with other students. Sometimes it was through magic but others? Hand to hand. Something that Logan was apparently quite good at. Throughout his years at the school, he often just resorted to using his fist whenever someone insulted or offended him and gained quite the reputation of someone not to mess around with. Furthermore, he was never one to settle down, going through girls (sometimes men) as if they were days of a week. When he was sixteen, a friend of his suggested to him joining a gym and becoming a professional boxer. Though he didn't take it seriously, he did once he entered his seventh year. Joining one, it began to take up all of his time, escaping to it whenever he could and when he couldn't? He was hidden somewhere practising. Due to this, it's a surprise Logan was even able to graduate. His school marks were nothing compared to his siblings but he found himself not caring. He had a career waiting.
He became a boxer, rising quickly through the ranks. By the time he was eighteen, he was one of the best in the country and was winning competitions left, right and centre. He was aware of the path his sister had gone down, she was never exactly subtle, but he found himself indifferent. It's not like he was innocent himself. He dallied in drugs and alcohol for years. Of course, he was subtle about it in the beginning, never doing it when he was around his family. However, it shifted when he met her. She was the sister of one of his rivals, someone he always struggled to beat and sometimes lost. It was a fifty fifty situation whenever he entered the ring. Originally, he flirted with her to anger her brother which most of the time it worked. She wasn't really into her brother's work, only going to make sure he had a drive home afterwards and was a witch, studying to become a healer. However, one time Logan lost, miserably, and was drinking alone in a room when she walked in. That night, they began to talk, actually talk and slowly, he got curious about her.
He pursued her for nearly a year, eventually scoring a date when he was nearing twenty two. For the next six years, they were happily dating, even letting her meet his family. By this time, Percy had been born and found the boy latching onto him, which he didn't mind, letting himself play with the boy. She had begun to convince him, though, to leave fighting and go into some sort of stable career and business, with Logan thinking maybe he should go back to school to follow his brother into becoming an auror. He was even thinking of marrying her. However, this changed when he was twenty eight. He'd gotten into a fight with her brother again at her birthday party. Logan, never having a good control over his temper, didn't stop when the two of them got into a fight. It was clear neither of them were going to stop, regardless of the state of the other one. His girlfriend, wanting to break them up, trying to drag them apart but her brother accidentally connected his fist into her, killing her almost instantly. Though he was cleared of any charges afterward, the brother was incarcerated, but Logan was never one to shy away from responsibility and acknowledged his own hand in her death.
Racked by grief, Logan returned straight back to his fighting career, throwing himself back into it as well as drinking more and more. He cut himself off completely from his family, running back to England in order to escape them. However, this caused visits from Artemisia, though these were once in a blue moon, and he often threatened her through violence to try and get her to stay away from him. He fell into a dark period and, as he was already known for his skills in the ring, became notorious for his ruthlessness and after a few months, many people gave up in trying to get through to him and for the next six years, he fell into a pattern. Fight, drink, fight, pass out. By his fourth year, it was rare for anyone to find him sober. It wasn't until he was 34 did he begin to get his act together.
He overdosed. He took a bottle of pills and barely survived the ordeal, having to be resuscitated. After the event, he let himself be put through rehab. It was here they forced him to get back in contact with the rest of his family. Soon, he found himself writing letters to his nephew, Percy, who, much to his surprise, had grown up and was in his teenage years. After leaving, he was put on the long road of recovery. He decided to become a personal trainer and a self defence teacher on the side.