. Here are things to know about him (and people with his personality type):

. ESTPs are Extraverted Sensing (Se) dominant. This means they thrive on taking in all the sensory information from the outer world and processing it before making a decision. They like to live in the moment and prefer to think about now versus later. They hate to be micro-managed, controlled, or forced to sit down and plan out long-term decisions. They would much rather find ways to enjoy and make the most of the current situation then worry about, or be tied to, something that may happen in the future.

. ESTPs are down-to-earth and practical. They like people to be straightforward and they pride themselves on keeping a level head. They get irritated quickly by emotional manipulation, or people who seek out drama or fish for compliments. Because ESTPs have tertiary Extraverted Feeling (Fe), they can easily pick up on other people's hidden motivations and feelings, and are surprisingly quick to discern phoniness or insecurity. Don't try to fool these clever types!

. ESTPs like to fix problems. They don't wallow, and they don't see the point in hashing out all their issues for no purpose. They get agitated by having to spend a lot of time listening to someone complain who doesn't want to be offered any practical advice. ESTPs are all about what's practical and they like to fix problems, not dwell on them. If you feel like venting without getting advice, make sure to say so at the beginning of your conversation; that will save them frustration later.

. This isn't 100% accurate for Hikaru. He can complain at times, and sometimes he does catch himself in self pity. However! Once he realizes it, he does his very best to fix the problem and make sure he doesn't do it again.

. ESTPs like to get from place to place rapidly and they move with a purpose. They are known for having some of the quickest reflexes of any of the personality types, and so I think this gives them a little more frustration when dealing with people who amble through life a little more leisurely. Slow drivers, people who take up the whole sidewalk with their friends and then proceed to walk slowly, these kinds of things make their blood boil.

. ESTPs have quick, logical minds due to their auxiliary use of Introverted Thinking (Ti). They have a vast, internalized mental map of how things work and they are constantly modifying it with new data and information. Because their thinking process is directed inwards and not externalized as it would be with a Te-user, some ESTPs are met with skepticism when they share their plans and ideas. Te-users will talk out their plans and logical objectives, and they may distrust Ti-users who seem to come up with plans and ideas out of the blue without walking other people through their thought process. This can be very frustrating to the ESTP who has spent a lot of time thinking through a plan or objective just to have it dismissed.

. Hikaru can be a very competitive person. Part of it could be his father, but he feels that since he was raised a villain, he should be better than those who didn't start training until recently. He feels the need to be stronger and better/advanced than a lot of people.

. Once he gets past his addiction, he "forgets" to take his meds for his ADHD for fear of slipping back into drug abuse.

. Hikaru beats himself up and feels that he deserves punishment whenever he messes up. He gets depressed whenever he does mess up and feels he's not worthy of anyone's love or worthy of any good thing because he's, in his words, 'so pathetic that I let a stupid substance control me'.

. Not only does Hikaru have excellent hearing, but he has a freaky sense of smell.

. Hikaru was found in late April, taken to the hospital, then fostered by FatGum. The entrance exam for UA was held in April, a little over a week after Hikaru was found and placed with FatGum. He gets accepted into UA, and by August, he's adopted by FatGum.

. His adoption day is August 26th.

. Hikaru had never, ever been told 'I love you' up until after he'd joined UA, when he was with Satsuki (who belongs to SpamChan, of course). He got emotional after hearing those words because he'd never been told that before, and he hadn't realized how much he'd wanted to hear those words up until he heard them.

. Hikaru craves drugs whenever he feels stressed or overwhelmed. He sometimes gets into the medicine cabinet and gets a high off of cough syrup, Dramamine, and he's even used his ADHD medication, Concerta.

. Side effects of Concerta are:
. Insomnia
. Nausea
. Decreased appetite
. Xerostomia
. Anxiety
. Hyperhidrosis
. Irritability

. Hikaru doesn't take meds for his bipolar, since there's a bipolar diet that helps with his mood and such. When he does good on his diet he's in a better mood, but when he allows himself some cheats, he doesn't do as well.

. The reason Hikaru has bipolar disorder is because of the tosui drug he used to take. It messes with one mentally, and the reason he ended up with a depressive disorder is because tosui increased the amount of dopamine in his brain, and over time, it couldn't produce as much dopamine on its own without the help of a drug. Luckily he is still capable of experiencing pleasure, happiness, and joy— it's just that he sometimes has moments where he can't feel happy.