Name: Toshinori Yagi | All Might.
Door: Left.

Canon: Boku no Hero Academia.
Canon Point: Chapter 70 / Episode 39. Note: The application contains spoilers for S3!

Age: 45.
Appearance: Muscle Form | True Form

History: SMAAAAASH.
Personality:

✓ Positive: Probably one of the most notable traits with Toshinori is the fact that he has a very "can do" attitude which is often an inspiration for others. As the Symbol of Peace, he's worked very hard to have a nearly immune spirit specifically around the subject of fighting crime. His positive energy is rather contagious, and he loves nothing more than giving people a pep talk when they need it. However, he isn't entirely optimistic over every situation or topic, but he definitely has been through a lot with determination and believe in his own person and in others.

✓ Protective: It's a huge part of his job as a Pro Hero and a vast part of his personality anchors on the idea of being a person that people can run to and rely on when things get rough. One of his catch phrase even reassures people to not worry because he is simply present— he wants to be a beacon of hope for anyone who is troubled or in danger. All Might is seen especially protective of any of his students as noted when the League of Villains attacked the school to the point where he wiped off his signature smile to show just how enraged he was. Basically, don't mess with his kids or anyone else he may care about.

✓ Amicable: Toshinori is extremely friendly and approachable despite his intimidating size and in his muscle form he always carries a reassuring smile that has a contagious effect of giving people hope just by the mere sight of him. Even in his true form he is very cordial nice despite his worn out appearance and lack of energy.

✓ Noble: He has an incredible sense of morals and justice and gladly goes out of his way to do what is right even if it means endangering himself to rescue someone else. On top of that, he seems to be a rather quaint individual who can be almost overly polite and considerate of everyone else around him. 

— Realistic: Even though his personality usually shines a positive aura when times are hard, there have been moments where Toshinori has been seen to toss his positive energy aside for the more intelligent and realistic outlook. This is seen mainly when he tells Izuku can't be a hero without a Quirk when asked. His realistic and optimistic side, especially when battle, seem to be at conflict with each other. It might do him good to be more realistic with things, but it shows every now and then. 

— Self-sacrificial: He typically pushes himself to the most extreme in dire times, putting himself in incredible risk for others. As ranked as Number One hero, this is extremely important to his personality. Even when he was severely injured, he insisted on pushing himself despite being in poor condition, going against doctors' orders, which leads to the next point...

— Headstrong: ...is being headstrong. Toshinori suffers from an injury that leaves his respiratory system and his stomach damaged. Even so, he still fights crime and overexherts himself. He's also seen stubborn in his decision to pass his Quirk onto another Quirkless person rather than a protege that the U.A. was grooming. Once he has made his mind up on something, there really is no going back.

✗ Prideful: In his world, Pro Heroes are often looked on as celebrities as well. They get plenty of attention and adoration from civilians, and as much, some of Toshinori's fame has gone to his head. He's the world's greatest hero— a legend— and there's plenty of attention he gains from people, merchandise, press fame, etc. It doesn't show off too much where it's overbearing in his personality, but Toshinori definitely as a streak of pride and he loves the attention he receives.

✗ Secretive: His secretiveness can almost lead to deceitfulness. Toshinori doesn't out right lie to people, but he has a tendency to with hold information, even to his protege. He's been having to hide his true identity for so long, only very few know his full story and origin. Still, this habit can cause him to with hold other harmless information.. such as his age, for example.

✗ Recklessness: He's a bit all over the place with a lot of things, but as mentioned, Toshinori does push himself to the extreme even in his older age. He doesn't seem to be considerate of his health or any other negative outcomes when he has set his mind on something. An example is pushing his Quirk to it's highest capacity to defeat his arch nemesis which eventually makes his Quirk burn out, making him Quirkess again. On top of that, he's done plenty of damage to the city (without harming citizens, at least) simply because he has his eyes focused on victory.

✗ Self-loathing: It isn't a heavy part of his personality, but Toshinori has been seen to feel like a failure when he is unable to save some one or when he feels weak. On top of this, he seems very much okay when he is told through prediction that he is to die soon which could be attached to the loathing part of his personality, however rarely he may show it.

Powers and Abilities:

Quirk "One for All": It is a super strong ability that stockpiles power and also allows the user to pass it on to someone else before eventually burning out. It also changes the appearance of its user, and in Toshinori's case it makes him a tall, muscular guy that completely hides his identity. One for All is a combat Quirk that can obliterate a buildings with a singular punch, enhances speed, strength, durability, etc. He can jump far distances with his legs, manipulate the atmosphere (even changing the weather from the whirlwinds he can make) and break hard structures, such as concrete, without scratching his body.
In a later canon point that I am taking him from, Toshinori loses his power, basically becoming Quirkless again. In Duplicity, he's taken from an earlier canon point where he can still use his Quirk, but it will be nerfed in different ways and his Quirk still has to be accessed carefully, risk it burning out..

Intelligence: Toshinori is rather clever in a combative mode, but he's shown having moments of oafishness, making him humorous to an extent. He doesn't always think things through in his daily life, but Toshinori is highly intelligent when it comes to combating with someone else.

Strength (nerfed): As mentioned, he is so strong, a singular punch can destroy buildings and manipulate the weather and he can jump long distances. In Duplicity, Toshinori will still have enough strength to punch a person and send them flying or break a wall with a single punch, but his gusts of wind caused from his attacks will not change the atmosphere or even push a person over.

Speed (nerfed): Even with weights on as a handicap, All Might is faster than his students to where he can appear at the blink of an eye. In Duplicity, Toshinori will still be faster than the average person in his muscle form, but cannot appear in a mere blink of the eye.

Durability (nerfed): He's not quite invincible, but he's very sturdy. An example is he called explosions to his face "uncomfortable" and "stinging." In Duplicity, Toshinori will be realistically durable as somebody who is as muscular as him (e.g an explosion to the face will cause critical damage and not merely "sting.")

Inventory:
1. One super suit. (I know clothing doesn't count, but I guess it's more of a special item of his.)
2. His cellphone.
3. A talking action figure... of himself.

Samples:

ALL MIGHT —
TDM with Jyushimatsu.
TDM with Shinsou.
TDM with Izuku.

TOSHINORI —
TDM with Ichimatsu.