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Okokok-so this one features things that you would probably know more about than me cuz you read the manga-so I may rely on you a teeny bit- 

Lukas lived a fairly normal life until he was 4 and his quirk started developing. His family quickly realized that he couldn't control it so he was constantly kept under close supervision, but they operated under the assumption that he would figure out how to control it as he got older, and since he was still young it was fairly easy to control him when he changed into his wolf form, since he was still just a cub. However, when Lu was 6 his entire family was killed in a villain related explosion that destroyed the majority of his district. During that time, his powers activated and he went on a rampage. Similarly to Hawks, the government found him and took him in for training, figuring he could be a great pro if he mastered his powers. He was actually kept in the same facility as Hawks, where Hawks basically became his big brother and protector. When Hawks got out of the facility before Lukas did, he lost a lot of the previous control he had over his quirk, growing incredibly angry and still being fairly emotionally volatile as he was young, about 12 at the time. He actually managed to escape the facility during one of his rampages, overpowering the guards. He wandered the streets for a bit causing a lot of trouble due to his inability to control himself before the LOV found him and took him in, amazed by his strength. He developed a really strong familial bond with them, all of them loving him in their own capacity as well, since y'know he's just so damn sweet and loveable. Shigaraki generally kept Lu as his secret weapon, pumping him full of trigger when he wanted to unleash an attack and releasing him with the Nomus. The worst part is that since Lu blacked out during his rampages, he had no idea what had happened or what he'd done, and Shiggy generally marketed Trigger to him as a drug that would help him so he didn't really know he was being used. He's especially close with Twice, Toga and Dabi, Compress, and Shiggy who he kinda regards like his dad.