"Close range fighter robot proficient in melee combat. Possesses flame generation ability, and can attack through self-detonation."
- Stage Select Description

Mighty No. 1, Pyrogen, is a robot with fire and explosion based abilities and the first created by Dr. White as part of the Mighty Numbers line. He is considered to be the leader of the Mighty Numbers team. He is the main and only boss of the Oil Platform stage.


Pyrogen's torso, arms and legs are almost entirely covered in gas burners. When unlit, Pyro's body appears somewhat scrawny, but when they are lit, his body becomes engulfed in a large armor-like flame. His face is mostly humanoid in shape, with blue-green eyes, orange skin, black stripes on the cheeks, a flat, red nose and a heavily protruding red jaw. The top of his head is designed like a helmet, black and red in color with a white brim and headphones like coverings emblazoned with his symbol, a sideways "Y"-like shape with two dots on the sides (which represents the fire element in various asian cultures), in black. Atop it are three burners that are constantly alight, creating the appearance of a topknot ponytail made of flames. His legs from the knee down appear similar to large, red greaves. They are symmetrical in design, the right having four circles connected to lines that extend to the back of the leg, and the right having a dark red flame pattern and the number "01" on the front in white and stylized to appear as if on fire. He is 223cm/7ft 4 inches tall, and weighs 236kg/520lbs.


When a virus suddenly causes nearly every robot in the United States to go berserk, Pyro is among the many robots afflicted, becoming feral and aggressive. He rampages through an oil platform, attempting to ignite it. Beck is sent by to the oil platform by Dr. White to locate Pyro and purify him of the virus. Pyro attacks Beck in a fiery rage, but is eventually defeated and brought back to his senses.

After Pyro is defeated, he will go to the Water Works Bureau to locate Cryosphere and assist Beck by melting the ice and starting the Bureau back up.

After all of the infected Mighty Numbers have been cured of the virus, Pyro joins them, Beck, and Dr. White in an attack on the Cherry Dynamics Robot Factory to shut down the production of malfunctioning robots.

After Beck defeats Trinity at the Battle Colosseum, Pyro is sent alongside the other Mighty Numbers to recover her and Beck from the collapsing structure.

Personality Edit

While under the effects of a virus that makes robots go berserk, Pyro becomes wild and violent. He rampages through an oil platform simply for the sake of burning as much as he can, and expresses anger when Beck, decidedly not on fire, arrives to confront him.

As the first of the robot created in the Mighty Number line, Pyro is considered the eldest sibling of the Mighty Numbers and the leader of the group. He has a confident and somewhat boisterous personality, but also seems to have a more caring and cool-headed side.

Abilities Edit

He can ignite the burners on his body to give himself a powerful flame armor, as well instantly ignite his burners to create a powerful explosion around himself. He can also leave fire pillars in his wake while running. Aside from his explosions, Pyro is largely a physical fighter who makes frequent use of charges, bear hugs and body slams.

Boss BattleEdit

Pyrogen will always jump to a specific position at either the left or right end of the area before initiating an attack. Before attacking, he will telegraph which attack he will use through his pose and voice. The player must also mind the burning walls on both sides of the area, which will damage them on contact.

Pyrogen will grunt and enter a runner's stance before charging to the opposite end of the room. The player can avoid Pyrogen and the trail of flames he leaves in his wake by simply jumping over him and dashing to safety.

Pyrogen will flex and yell "Crush", before charging forward and jumping to attempt to body slam the player, triggering an explosion on impact with the ground. Dashing underneath and away from Pyrogen before he lands is the most effective way to dodge this attack.

Pyrogen will pound his fists and yell "Here it comes," before charging forward and triggering an explosion once within a certain distance from the player. The explosion is too large to avoid by jumping over Pyrogen, so the player must meet him mid-charge and quickly move away to escape.

After losing half of his health, Pyrogen will jump to the foreground and reignite himself, now with blue flames overlaid atop his normal ones, then return to the battle. In this form, all of Pyrogen's attacks deal greater damage, but can otherwise be avoided in the same ways. However, if Pyrogen makes direct contact with the player while using an attack in this form, he will trap them in place with a bear hug and trigger an explosion powerful enough to kill them instantly. When Pyrogen is next absorbed, he will lose his blue flames until he jumps to the foreground again.

Other Appearances Edit

Pyrogen appears in the 8-bit crossover game Mighty Gunvolt as a Downloadable Content boss character alongside a version of the Oil Platform stage.

Pyrogen reprises his role as a boss character in the game Mighty Gunvolt Burst. Pyrogen now has the ability of create a giant punch made of fire coming out from the fire walls whenever he punches the opposite side of the screen (similar to Carrera's magnetic attacks from Azure Striker Gunvolt), he can climb up his fire walls to make a body slam, and his explosion attack will form by absorbing small fire balls from the fire wall, making it stronger and bigger, taking up most of the screen, making the corners the only safe place.


At the start of Pyrogen's development, the team decided to make a fire-based boss. Specifically, they wanted his entire body to be like a flaming sun or furnace. Kimo Kimo came up with a sun, furnace and boxer based robot. After lots of trial and error, Inafune drew a sketch as a counter-proposal. Inafune felt it would be fun if Pyrogen's design was a flaming, muscle mass, only to reveal a thin frame of gas burners that make the flames. His non-flamed design is based on the top of a Zippo-style lighter.


  • Pyrogen and the first 5 Mighty Robots you encounter in the game all appear to be a throwbacks to the first 6 Robot Masters from Mega Man. Mighty No. 1 has the most in common with his supposed predecessor Fire Man. Like Fire Man, Pyrogen's design was based off of a Zippo lighter where Fire Man was believed to be based off of a torch or a knight. He also has some similarities to Heat Man as well as FlameMan.EXE from the Mega Man Battle Network series and Apollo Flame from the Mega Man Star Force series. He also bears a strong resemblance to Flame Hyenard from Mega Man X7 both from his body made of gas burners and his habit of yelling during battle.
  • Sometimes during his boss battle, when doing his "bear hug" attack, a glitch may occur, making the player escape from Pyrogen, but still be insta-killed by the attack.


Concept ArtEdit

Mighty Numbers
Pyrogen · Cryosphere · Dynatron · Seismic · Battalion · Aviator · Brandish · Countershade · Beck