Takamiya Hoshino is the heiress of the Takamiya Group, and a young woman with a rather eclectic personality. Depending on who is giving their opinion, Hoshino might be considered far from genuine. She has assimilated a number of different personality quirks into her own, sometimes even large portions of personality types, and created a complex persona out of it. Even though Hoshino adopted these various traits and quirks, it is what she honestly likes or wants to be, so others might say she is genuinely living the way she wants to.

A large portion of her personality comes from her upbringing. As part of the Takamiya Group, she has been fostered for the business world, and can be exceptionally talented at hiding her emotions. Likewise, she is capable of adopting a very proper and businesslike mien that can allow her to integrate in that particular circle.

Another large portion stems from her family's history. The Takamiya clan was historically a shinobi clan, and though they are not actively practicing their shinobi ways, they do maintain the old traditions, teach the techniques, and make use of the teachings on a personal basis. Hoshino's desire to become a hero despite her obvious shortcomings undoubtedly stems from this aspect of who she is and what she has learned, especially since she uses her shinobi traditions in lieu of her quirk. 

These create her surface layer. Hoshino often appears withdraw, disinterested, quiet, and calm. She goes about her day without creating waves and plays video games in her free time. It isn't anything too abnormal. 

However, with the flip of a switch, the stuff that actually makes Hoshino who she is can come to the front. It's like an energetic, somewhat bombastic gamer otaku merged with a delinquent punk, or some sort of mainstream TV persona gangster, and somehow managed to not split apart at the seams.

What was once a rather composed and amicable young lady switches into a very aggressive, passionate, and focused girl who has a major rebellious streak, a serious lack of patience, a tendency to spout nonsensical, threatening phrases when confronted, and a problem whaling on gacha games.

She's not intolerable to be around, but it can be very jarring for those unfamiliar with her to run into Hoshino when she switches things up. Generally, it is triggered by something, such as frustration or a need to complete a daunting task, but once it does it sticks around for a while. This personality does tend to put her at odds with authority figures, and she has a major dislike of any such figures she views as impotent or corrupt. It is very likely she will get in trouble on occasion because of it. 

Hoshino considers herself something of an artist and an individual of impeccable taste, and has been known to tag walls and other surfaces with spray paint when she is out and about. She has been scolded several times for it, but hasn't been in too much trouble to date.

Of course, her aggressiveness gets turned towards being a hero, or in her case, more of a vigilante. She may be in the hero student course, but she has no intention of waiting to learn before trying to make the world a better place. She doesn't put up with weakness, nor does she tolerate cowards, fools, or bigots. Hoshino ventures out into the night and tries to take on trouble makers (like herself) and generally gets into trouble doing so.

Hoshino is a little different than some heroes. She doesn't hold back, she isn't going to show any mercy, and she will use every tool at her disposal to win. She knows that she isn't like everyone else, and that most of the villains she will encounter will be superpowered by their quirks. They have a massive advantage, and if she doesn't go 100% all-in every time she might just end up dead.

Hoshino is the eldest daughter and first born child of Takamiya Daishin, president and CEO of the Takamiya Group, and his wife, Chinami. As their eldest child, Hoshino's birth established her as the heiress to her family's legacy. The Takamiya Group stands proudly as one of Japan's foremost business entities, taking a true pioneering spirit to capitalist ventures, and thus commands a great deal of investment capital, and drives innovation across the country through hundreds of subsidiary companies.

The responsibility placed upon the shoulders of the youngster was great, and it necessitated certain things. Even as a toddler, Hoshino was surrounded by aids, effectively ladies-in-waiting, who waited on her hand-and-foot. They took care of everything she needed, but more importantly, they steered the development of Hoshino from a rambunctious child towards a more even-keeled and proper young lady.

Resistance was expected, experienced, but ultimately futile. Hoshino was not given the option to dissent or become her own person. She had a destiny, and that destiny was to take over the family business and lead it to greatness. If she wasn't ready, it would be a failure on her father, a shame on their legacy, and possibly devastating to a corporate empire.

To raise her as the proper young lady she needed to be, as soon as she was of age, Hoshino was sent to school, and not just any school, but the best school that money and influence could buy. Her father had a firm belief that education wasn't as important as connections, and perhaps there is some merit to that, too. 

This elite and prestigious school served as a foundation for Hoshino that she'd benefit from going forward, and also served as a starting point for numerous friendships she'd have well into her later years - many of which could yield possible benefits for the Takamiya Group. 

However, traditional education was not the only thing that Hoshino would learn. There were also the traditions the Takamiya family. Information, skills, techniques, and history needed to be preserved, and like the rest of her family, she would be taught. Hoshino would learn the ways of the shinobi.

By the time Hoshino began middle school, she was already training in her family's ancient ways. It began mostly as conditioning. Physical attributes needed to be raised, as did mental fortitude. Without them, she'd find learning their methods too difficult. She took to the training well enough, and results were promising, so her father was pleased. He may have preferred a son, but in today's world, it didn't make so much of a difference. A successful daughter like Hoshino would suffice.

Her training soon began to evolve, and with it, so did she. She was no longer just some little heiress to the family fortune, all prim and proper, but someone on a journey to a complex existence fill with intrigue and danger.

One thing her parents underestimated, or did not account for, began showing itself around the time she was accepted into her high school. Hoshino had spent so long under the thumb of her parents that she never really figured out who she was. Unlike most other kids her age, she had no identity for herself, and so she began assimilating things around her that intrigued her and quickly, perhaps even haphazardly, wove a tapestry that would serve as her self. 

Hoshino picked what was popular at the time, or whatever sparked her interest. It could have been anything, and sometimes, it was. She took up being a bit of an otaku. She found a fascination in anime and video games, two of her greatest passions to this day. She picked up manga and even started writing her own fan manga which helped develop some decent art skills which eventually translated into street art. 

Where the otaku was often the passion or coolness of something found in hobbies and introverted activities, Hoshino's other side was quite the opposite. She also assimilated the delinquent, the troublemaker, the stand-out crowd. The ones who rebelled against society to make a name for themselves, the ones who stood up to authority and never bent or broke, the ones who presented themselves with extreme confidence and even aggression, asserting a type of dominance over others.

These aspects of Hoshino came together and created a rather eclectic and unique set of skills, hobbies, and interest. Art, music, sports, video games, fancy cars, motorcycles, and more. Everything blended together and by the time Hoshino graduated from high school, she had become almost unrecognizable.

It could have been a horrible development for many, but Hoshino's training from her youth persisted, and she could switch from one to the other in the blink of an eye. So, her father was not entirely dissatisfied. Hoshino was still a suitable heir. 

In a world of quirks, those without quirks can often feel inferior or helpless. Hoshino, being quirkless, could have ended up that way. However, she had been empowered through years of psychological training to believe that she was just superior to others in some way, or, at a minimum that no one was better than her. 

In a characteristically appropriate choice, yet an extremely unexpected one for her father, Hoshino applied to UA university. As someone without a quirk, she was immediately less capable of becoming a hero than others who had some useful super power. However, she had some things that other people didn't. She had a lot of money, influence, and connections to acquire numerous support items that could make up for her natural short-comings, and she had an innate fierceness and a suspicious willingness to endanger others (mostly villains). 

By combining these things, Hoshino was able to use her ninjutsu training, a lot of explosives, and a healthy dose of tenacity to pass the entrance exams, joining a handful of other students in UA's illustrious history to prove that a quirk isn't necessary to become a hero.

Her methods and mentality, namely being less suited to the work, yet among the fiercest and most aggressive of her peers, led her to get the nickname Lemmings, which would become her hero name. Much like her, the actual rodent is a small, impotent creature willing to take on any threat despite being woefully inadequate to do so. The name has stuck, chiefly due to being quite appropriate.

Perhaps the success went to her head, or the desire to do good was already there, but Hoshino wasn't entirely willing to wait for her hero license to actually do hero work. 

She gathered some friends, purchased an apartment nearby to use as a headquarters, and from there, operates as a rather unsuccessful vigilante while simultaneously attending UA University.

It has resulted in her getting in a bit of trouble from time-to-time, but thus far it hasn't been anything she couldn't talk, or bribe, her way out of. That could change, or perhaps her good luck would continue and she might find some success.

The Takamiya Clan has been practicing ninjutsu for half a millennia - maybe longer, and their traditions are strong and refined. Though the ninjutsu of the modern mind is heavily influenced by works of fiction, real ninjutsu is different. It is the art of deception, illusion, and subtle crafts of sabotage, espionage, and infiltration. Unfortunately, as mystical as it may seem, it is just tricks.

These traditions began with siege craft and ambushing, attacking in the dead of night and stealing away before anyone was the wiser. They also included infiltrating the enemy, blending into the environment, and destruction of sensitive targets. Hoshino has practiced the ancient teachings and learned them well.

She is able to set ambushes, move quickly and silently, perfect for setting ambushes or sneaking into places undetected where others might fail.

The Takamiya Clan has been practicing ninjutsu for half a millennia - maybe longer, and their traditions are strong and refined. Though the ninjutsu of the modern mind is heavily influenced by works of fiction, real ninjutsu is different. It is the art of deception, illusion, and subtle crafts of sabotage, espionage, and infiltration. Unfortunately, as mystical as it may seem, it is just tricks.

These traditions included infiltrating the enemy by blending into the environment and deceiving anyone who looked upon them with scrutiny. Hoshino has practiced these ancient teachings and learned them well.

She is able to disguise herself quickly and efficiently, and she can deceive others with expertly crafted lies off the top of her head or make good use of props, unfolding situations, or basic chaos of the world around her to slip away or confuse pursuers.

If Hoshino hadn't had some martial arts training, she'd likely never have made it into UAU. As part of her traditional ninjutsu training, Hoshino was taught karate, as well as several forms of weapon use that have served her well. She may still have a long way to go, but it has given her the edge she needed to past the entrance exams. 

Because she lacks a quirk (or maybe for other reasons) Hoshino has elected to utilize explosives. Her skills and knowledge cover the basics of preparation, usage, and occasionally manufacturing of various types of explosive ordinance.

She has a general knowledge of various primers, timers, remote controls, payloads, types of explosives, how to identify them, how to defuse them or make them inert, and most importantly, how to use them in battle or to ambush others.