Background
Haru's mother, Makise Tanaka, was a notorious villain, wanted on many charges including murder, grevious bodily harm, torture, arson and kidnapping.His father, a hero, Urahara Tanaka, met their mother on a stake out where he was sent to arrest her. The two eloped, and had their first child Haru Tanaka, who grew to look a lot like their father. A few years later, when Haru was Four, Homura Tanaka (@HomuraTanaka) was born, a beautiful blonde baby girl, with short straight horns. The pair were overjoyed, and a year later Fuzen (@FuzenTanaka) was born, with curling horns, and thick black hair, just like her mother.
As the trio grew, their mother continued with her villanous activities, much to the chagrin of their father. They were raised in the same house as their grandparents, Toshiro and Himawari Tanaka, who made their distatse at Makise's actions evident at any chance they got.
When Haru turned 10, he was taken away by his mother, on the basis that he was too dangerous to be with his sisters and father, because of his quirk. Haru grew believing that he was the reason for his families divide, and that his mother resented him for breaking up her marriage and home life.
He did come to know however, that this was not the case, and that his mother had in-fact tried to separate out each of her children so she could raise her own line of villain descendent. While this information led Haru to hate his mother, he was at her disposal, and so eventually learned to conceal that hatred and move past it.
As he grew he was put through rigorous training in the League of Villains, and spent most of his time in prison like conditions, until he turned sixteen, when they started sending him on more work of his own, to utilise his skills, particularly in things such as robberies, and disposal of evidence.
Part of his being out in the open on his own work, meant he had more freedom. Through this freedom he met a lot of interesting people, and eventually met Aimi Ito, a beautiful girl, three years older than him, who loved libraries, and fancy coffee. He spent a lot of time in her company, and ended up fathering a child with her, who they called Hiroki. Although they enjoyed each others company, their relationship was not what could be called romantic or emotional, and very soon after Hiroki's birth, they parted ways. Haru spent every minute outside of the League of Villains with his son, as Aimi worked very long hours.
On Hiroki's fifth birthday, Haru made his way to the flat that Aimi and Hiroki lived in, to find it completely trashed, their belongings rifled through, and tipped out onto the floor. Aimi was found dead in the appartment, and Hiroki was no where to be seen. Haru was bereft, and moved out of his quarters at the League of Villains Headquarters, he was adamant to search for his son, he had a sinking suspicion he knew who to point blame at, but would work towards finding Hiroki no matter what the cost.
Haru continued to work for the League, as it allowed him the space and means to search without boundaries, he recently reunited with his younger sisters, and father.