Hawks is a young man of average height, having blonde hair swept backwards along with a pair of gold-brown eyes that appear to resemble that of a bird, along with some stubble underneath his chin. His Quirk gives him a pair of large, bright red wings with feathers that lengthen as they proceed downwards.
Hawks hero costume resembles that of an aviator's uniform, it is yellow in color and lined with white fur. He wears a black top underneath which has a golden pattern, along with a yellow-tinted visor to protect his eyes, as well as black gloves and boots. He is also seen wearing headphones that likely serve to protect his ears from the high velocities he flies at.
After the War, due to his fight with Dabi, he sustained major injuries all over his body. This is shown where is has a scar stretched over his jawline after his recovery. He is also wearing a neck brace along with a new undercut with his current hairstyle.
Hawks is usually characterized by his seemingly chilled, easy-going and relaxed demeanour, as shown by him speaking his mind during the Hero Billboard Chart JP, and casually calming an angered Endeavor who viewed his attitude as disrespectful. Despite seeming laid-back however, Hawks is actually on high alert, using his Quirk to casually stop a criminal, save a dog from getting run over, as well as help an old lady with her bag. Hawks has also shown to interact kindly with his fans, as seen when a bunch of them congratulated him for making the number 2 spot. He is also friendly with Endeavor, despite the latter's crude attitude and high temper, congratulating him over becoming the Number 1 Hero and wanting to help him. It is eventually revealed that he has been a fan of Endeavor since he was young.
While open about his opinions, Hawks does show to have a good heart, he wishes for his fellow heroes to have a relaxed routine where they can take it easy once in a while and have time to spare. Despite appearing carefree and relaxed, he is in fact very stressed and hard-working over his hero duties, following the HSPC's orders dutifully. He admitted to Fumikage Tokoyami that he took the latter on only to learn more about the League of Villains (as well as the fact that they were both birds), but later decided to inspire the young hero in training and giving him some words of wisdom. He also held guilt over Endeavor gaining a scar after the Nomu attack, with him containing the High-End so casualties could be kept at a minimum.
Hawks also shows to be highly intelligent, having been trained by the HSPC at a young age and mastering the skills of espionage and infiltration. He has full control over his facial expressions and way of speech, making him an expert liar, although he admits that he doesn't like lying claiming it to be too much work. These traits allowed him to successfully work his way into the Liberation Army, and fool the villains into thinking he was on their side. In essence, Hawks is a prodigy having started his own Hero Agency at the young age of 18 and reaching the Top Ten Hero Rankings in the second half of that same year, being the youngest hero to do so.
Despite his laid-back and friendly attitude however, a darker side of Hawks personality is shown during his infiltration of the Liberation Army. While still on the good side, his conscience flashes through with his disgust towards Dabi following the attacks, leading to him to threaten the villain with one of his feather blades. He later shows that, despite being a hero and a good person at heart, that this darker side also has the capacity to kill. While Hawks maintained a friendship and earned the trust of the villain, Twice, he did feel guilty about lying to him and eventually having to betray his trust. He soon finds Twice to be a good individual despite the latter being a villain, and thus wanted to redeem Twice and help him get back on his feet.
After realizing that Twice wouldn't come quietly however, as well as seeing that he wouldn't turn on the League, Hawks reluctantly killed the villain in acknowledging that he was too dangerous to keep alive.
Keigo's parents lived in extreme poverty, with his father turning to robbery while his wife Tomie used her eyeball detachment Quirk to scan for any guards. When his father was caught killing someone in a mugging attempt, his mother harbored him and Keigo ended up being accidentally born.
Keigo's father abused him physically and verbally, wishing the boy had never been born, but Keigo always shrugged the abuse off as he believed that his parents were broken inside. Keigo distracted himself by watching Pro Heroes like Endeavor and All Might on TV. Tomie snuck Keigo out of the house to buy an Endeavor doll and wanted him to grow up to be like the Flame Hero. Keigo grew attached to the doll, and started to idolize Endeavor due to the doll being his first real possession.
His father was eventually arrested after Endeavor caught him, and Keigo began to believe that heroes (especially his idol) really were real. However, the other two Takamis had to flee the house for harboring a fugitive, and they were unable to survive due to having no money and Tomie's severe mental illnesses. One day, Keigo ended up saving several people using his feathers in a car accident, causing the Hero Public Safety Commission to approach him. They promised to give Keigo and Tomie a chance to start over, removing the name Takami due to being tied with a criminal now, and Keigo was recruited into the HPSC and given training unorthodox to the methods of traditional heroes. Fierce Wings: Hawks' Quirk grants him a set of broad red wings which grants him the ability to fly at extreme speeds. Aside from flight, Hawks can also telekinetically control each and every one of his feathers, he can launch them from his wings to serve a multitude of purposes, whether it be attacking villains or saving civilians. His feathers are both light yet sturdy, and Hawks can take his lengthier feathers and use them as blades. On top of all this, Hawks can also use his feathers to detect sounds and vibrations around them, allowing him to locate people and pick up on chatter and conversations.
The more feathers that Hawks uses, the more his flying abilities are impaired. Furthermore, his feathers are vulnerable to being burned and/or destroyed, making Hawks weak against enemies with fire abilities. If all his feathers are destroyed then his main wings will regrow them in two days.
Extremely high intelligence: Aside from his Quirk, it should be noted that Hawks is very clever, smart and strategic. Having been trained by the Hero Public Safety Commission from a very young age. Hawks has been taught how to handle many experiences as well as perfectly control his facial features, being able to appear perfectly chilled and relaxed, while at the same time maintaining constant vigilance.
Espionage: Hawks was capable of infiltrating and passing himself off as willing to work for the villains of the Paranormal Liberation Front. All while avoiding suspicion from it's leaders and members, excluding Dabi who eventually found him out, although Hawks was aware of the villain's suspicion and shook him off long enough to discover Shigaraki's location.
Overall, Hawks is an extremely powerful Pro Hero, able to utilise his Fierce Wings Quirk to full usefulness. Despite it lacking brute power, he makes up for this by playing a strong supportive role when teaming up with more powerful heroes like Endeavor. His pure skilfulness and sharp intelligence makes him a vital asset to the heroes.