Prior to Usagi's backstory where he mentioned his father's death and his mother and him living on the life insurance payout, I had a different headcanon for his backstory that explained why Meryl Mei insists he's a good kid despite constantly buying drugs from the gang and being an oddball.

Usagi is the oldest of many siblings ranging from those just a few years younger than him to toddlers. The Alohaoes have lived below the poverty line for generations and the family were no strangers to losing their members to gang life, drug addiction, crippling debt, or a combination of the three. Some of those members, like Usagi's parents, try to make an honest living as working class folks, but both end up working long hours to barely get by and government assistance can only go so far.

As the oldest sibling, Usagi ended up being de-facto man of the house, making sure his siblings get to school on time, attend their games and doctor's appointments, tucking them in at the end of the day, staying up when one or five get sick. Usagi's parents do love him, but there's that underlying obligation and guilt Usagi feels if he doesn't step up to help the family in any way, and his parents can only do so much after being out of the house for so long and splitting time between their kids for quality time.

Usagi knows his parents are working multiple dead-end jobs, unable to be promoted or change to better careers due to lack of education and opportunities, and they end up coming home late at night to be taken care of by him before doing it all over again the next day. While balancing his own studies and trying to go through the day of caring for his family and house, Usagi ends up being addicted to hard drugs out of necessity rather than pleasure. Coffee and nicotine patches can only keep you up and alert for so long, and sometimes there are days where sleep is not an option; the longest he's stayed up is 31.5 hours straight followed by crashing for 5 hours and waking up to resume his schedule as if nothing happened. Sometimes, the drugs suppress his appetite, which allows him to go long without eating in case he doesn't get a chance to sit down.

The worst part and another reason for him being addicted to drugs is the fact that he's a natural genius.

Upon realizing how intelligent and inquisitive their son is, his parents are also banking on him to be the first of the Alohaoes to graduate high school and go to college without a criminal record or other issues. If Usagi gets a well-paying degree and job, the Alohaoes can breathe easier in terms of finance and Usagi can become an example for future generations to eventually get the Alohaoes out of the poverty cycle. So, not only is Usagi taking care of his siblings but he ends up overseeing the household such as taxes and bills, talking to authorities to prevent them from escalating situations near his home, filling out forms for welfare and arguing with health insurance companies at a very young age. His family unconciously expect him to be able to do anything because of his intelligence and they're hoping his grades would allow him to receive free scholarships among other things.

Like many who experienced living below the poverty line, the idea of mental health and attempts to ease this load while the system is intentionally working against you is met with "just deal with it" instead. Finding someone to vent to or provide help is difficult and could cause more harm than good if someome takes things out of context. Someone called CPS on them once because Usagi made an offhand remark on how tired he was; Usagi had to stop the case from escalating in fear that his siblings would be separated "because he made a stupid mistake" and feels guilty for what he did despite being honest at the time.

The drugs Usagi takes doesn't only keep him up but also hide who he really is. While he appears jovial, irresponsible, and amicable on drugs, he's the complete opposite when sober. I imagine him to be like Fugo: cynical, bitter, easy to anger but unable to express it. The bodysuit he wears is intentionally fitted not only to minimize issues caused by skin irritation and bug bites (seeing how he has that in his backpack) but it also doubles as a calming compression suit to ease his bottled emotions. It could be hiding other things but who knows. He's good at hiding things... too good.

Usagi doesn't want to lash out on his loved ones nor show what he's going through. He keeps himself high to maintain his fake persona and remain likeable, but it would only be so long before he breaks and shows who he really is.

Anyways, what do y'all think?