Hellfire Flame

Speed is strength.

Hellfire Flame (業火のフレイム, Gōka no fureimu) was a ninja partner of Gale Wind who both came from the 37th Graduation Class "Golden" of The Village. In the past, they joined the Monster Association to become stronger.

Appearance
Hellfire Flame is a tall man with a muscular build who styles his black hair into spikes with the tips bending down. His face is angular, with thick eyebrows, and he has a black marking over his left eye.

Hellfire Flames attire consists of a sleeveless black shirt and pants, a white vest with spiked collar and flame design, black arm warmers and braces on his forearm and neck.

When he transforms into a monster, his teeth become sharp and he has pulsating veins. His hands also have sharp claws and his entire body is imbued with burning flames.

Personality
Hellfire Flame is shown to be calm and serious most of the time. He also seems to go along to what Gale Wind tells him. He holds a grudge on Flashy Flash for causing the 44th Graduation Class incident known as "The End”.

When he was on the verge of death, he revealed that being ninjas, they were forced to work in the shadows and were treated as tools instead of people, and the true reason they became monsters was that they wanted to be on the side of plunderers and rulers for once in their lives.

Monster Association Arc
Hellfire Flame and Gale Wind attack Speed-o'-Sound Sonic in a forest as a form of skinship and introduce themselves as Sonic's senior from their Ninja Village. After some discussing, Gale Wind and Hellfire Flame invite Sonic to join the Monster Association to further their goal to become rulers of the World. Gale Wind reveals their plan to attack the Hero Association, more specifically killing Flashy Flash and asks Sonic's help to distract the other heroes. When Sonic refuses, Gale Wind transforms into a monster and demonstrates his speed, shocking Sonic and explains the process of the transformation. They then offer a Monster Cell to Sonic and leave. He and Gale Wind are present at Gyoro Gyoro's speech. During Garou's appearance in the Monster Association meeting, Hellfire Flame and Gale Wind express their doubt about Garou's position as a potential executive member and replacement for Gouketsu and Elder Centipede. However, they immediately push aside that matter and focus on how to they can kill Flashy Flash. Furthermore, they also wonder why Sonic still hasn't joined them and assume that he is not compatible with the Monster Cell.

He and Gale Wind are seen training together, preparing for the upcoming battle against the Hero Association.

Hellfire Flame and Gale Wind find Flashy Flash in the Monster Association base. They compliment him on his speed before they do battle. Eventually, they are both forced to reveal their monster forms after realizing they are outclassed in their human forms. They continuing battling, and the two monsters are able to pressure Flashy Flash, managing to make him cough up blood, but once the hero sees the opportunity to attack both of them at once, he strikes them with a series of kicks they're unable to counter, and then slices both of them in half, ending their lives. During the battle between Child Emperor and Phoenix Man, Phoenix Man resurrected their corpses as zombie to fight Brave Giants. However, Child Emperor activates Gigavolt Smash, disintegration their corpses.

Abilities and Powers
As a graduated ninja of Sonic's village, he is shown to be an immensely powerful speedster like his partner, Gale Wind. Coming from the "Golden" 37th class of the village, he is no doubt an even greater ninja than Sonic and thus could qualify for the S-Class rank of the Hero Association if he had joined them instead. Hellfire Flame and Gale Wind display excellent teamwork skills and cover for each other in battle. Although Hellfire Flame and Gale Wind are classified as Demon in their human form, their monster form takes on the classification of Dragon, drastically increasing their already immense speed and pressuring the likes of Flashy Flash. He and Gale were cadre candidates.

Supernatural Abilities
Pyrokinesis: Hellfire Flame has an extremely potent hot touch, with which he is able to ignite nearby objects. He can creates flames around his fists.

Physical Abilities
Immense Speed and Reflexes: Being from a ninja village, Hellfire Flame has superhuman speed that surpasses most characters in the series. He and Gale Wind were able to surround Sonic and strike the younger ninja continuously in a barrage quicker than the eye could see. Hellfire Flame is able to compete with Flashy Flash and push him to take him seriously. Upon transforming, Hellfire Flame's speed increased drastically, pressuring Flashy Flash enough that he widened his eyes in surprise and was barely able to block both of their attacks.

Enhanced Strength: Hellfire Flame is capable of destroying concrete with minimal effort. Additionally, the shockwaves produced by the battle between the two ninja monsters and Flashy Flash were powerful enough to destroy the large ravine they were fighting in.

Transformation: Hellfire Flame can change into his monster form and revert back to his human form freely. According to him, people who can fully control their bodies will be able to retain their human form. As a powerful ninja he has excellent control over his body, although it is stated by Flashy Flash that they still lack full control in holding back their power due to becoming monsters recently.

Fighting Style

 * Master Ninja: As a graduate of the ninja village Sonic hails from, Hellfire Flame is skilled and masterful in ninjutsu. Having graduated from the "Golden Class" that is renowned as the best the village has produced, Hellfire Flame is without a doubt a greater and more powerful ninja than Sonic.
 * Flame Blade Kick (炎刃脚, Enjinkyaku): Hellfire Flame can deliver a powerful fire-imbued kick.
 * Tempest Blade Kick (嵐刃脚, Ranjinkyaku): Gale Wind and Hellfire Blade kick their opponents at the same time with their respective elements.
 * Fire Release Blazing Scattering Slash (火遁散閃斬,  ): Hellfire Flame unleashes a quick succession of slashes embedded with fire onto his opponent.

Equipment

 * Katana: Hellfire Flame wields a katana with a white hilt and a square cross-guard. He is a proficient wielder of a sword and can ignite it on fire. The flames can shoot small fireballs.

Quotes

 * "Assassins like us exist only in the shadows... treated not as humans but as mere tools, endlessly exploited. We wanted to be on the side of the plunderers... the rulers, just for once..."

Trivia

 * In the webcomic, there is a monster named Hellfire with a partner named Gale who also try to kill Flashy Flash. ONE said that he designed them based on characters from other series, to prevent copyrght problems they were changed.


 * He is among the few monsters of human origin who can access their human form, the others being his partner Gale Wind, Surprise-Attack Plum and Haragiri.