Brave Giant

Brave Giant is a very powerful robot designed by Child Emperor. It is his ultimate weapon and his trump card, although according to Child Emperor, it is still a prototype.

Appearance
Originally, Brave Giant was a large white robot with a smooth and towering appearance. He had three fins coming out of his forehead, and there were several lights placed around his body. However, Murata decided to change the design as well as redo Chapter 99.

In the final updated version of Chapter 99, Brave Giant has many more parts added to him and has more jagged ends on his limbs. Brave Giant now has two pairs of eyes and four fins protruding out of his head in a backwards fashion. There are also several blades and such popping out of his shoulders, as well as on his ankles, knees, and waist. On his back there is a large backpack, mimicking Child Emperor's own backpack, and inside it are large jet propulsors, wings, and rockets that allow Brave Giant to fly at high velocities and shoot multiple different weapons.

Monster Association Arc
After Phoenix Man is resurrected and Child Emperor realizes his new and dangerous strength, the hero clicks his watch and summons the parts of the Brave Giant which are situated around the Monster Association Headquarters. Once Brave Giant is summoned, it swats Phoenix Man across the room, and the two begin their second battle. As the two of them do battle, Phoenix Man realizes that Child Emperor is rushing to finish the battle and realizes that there must be some limitations to the Brave Giant and that he can only operate it for a limited time. His hypothesis is correct, as Child Emperor laments that Brave Giant can only operate for 2 minutes and 38 seconds before its energy becomes uncontrollable and it self-destructs.

As the two continue their battle and unleash their respective special moves and combos, Child Emperor manages to trap Phoenix Man in a very strong electromagnetic web and punches him with his Giant Knuckle Sandwich. A struggle ensues, with Phoenix Man appearing to overpower Brave Giant, but Child Emperor then activates overboosters and releases output limiters. The energy from the punch finally overpowers Phoenix Man and destroys the floor, sending both warriors falling into water. Upon touching the base of the ground, Brave Giant's lights turn on and Child Emperor is shocked to see the corpses of several monsters littering the floor. Suddenly, a bright burst of energy is unleashed, knocking the Brave Giant back.

Phoenix Man, once again resurrected and stronger than ever, rips off Brave Giant's arm, taking the hostage Waganma with it, and uses his new powers to puppeteer the corpses in the subterranean pool and attack Brave Giant. Phoenix Man then flies out of the water to make his escape in the chaos. With little time remaining, Child Emperor makes Brave Giant's arm revert to its original drill form and knocks Waganma out of Phoenix Man's grasp. Brave Giant then destroys the multitude of reanimated corpses and flies out of the water to meet Phoenix Man, regaining its lost arm in order to use its final attack, Millennium Emperor Nova, and blasts Phoenix Man into the sky with a massive laser.

Brave Giant shuts down having spent its time limit. Little Braves come out from hiding and push the inactive Brave Giant at Phoenix Man. Child Emperor activates the emergency hatch and catches the monster with Brave Giant. Phoenix Man destroys Brave Giant but it allowed Child Emperor enough time to sneak in Tickle Tickle Bug No. 1 within Phoenix Man's costume and cause him to rip off his costume.

Abilities and Powers
Being the trump card of the S-class genius Child Emperor, the Brave Giant is an extremely powerful and useful weapon, dwarfing all of Child Emperor's other machines in might. With Brave Giant, Child Emperor is able to go toe-to-toe against a Dragon-level mysterious being and when unleashing its full power, is able to temporarily knock out said mysterious being. Unfortunately, Brave Giant can only be operated for 2 minutes and 38 seconds before the energy core will no longer be controllable and will self-destruct, significantly limiting its capabilities.

Physical Abilities
Immense Strength: Being a large mecha and Child Emperor's trump card, Brave Giant is immensely strong. It is able to effortlessly smash through multiple stone pillars and destroy an entire floor of the Monster Association headquarters. It was able to combat resurrected Phoenix Man's immense strength and once it unleashed its full power, it actually managed to defeat the Dragon-level monster and temporarily knock him out of commission before he resurrected again.

Immense Speed and Reflexes: Despite its large size, it has surprisingly advanced speed, being able to keep up with the dragon-level monster Phoenix Man and launch multiple speedy-quick attacks.

Immense Durability: Brave Giant's advanced body and sturdy exterior allows him to defend against searing attacks from Phoenix Man, and his Divider Shield was able to withstand the multiple '''Phoenix Homing Wing Attacks. '''Additionally, it was still operational after releasing all of its output limiters and unleashing its full power.

Anti-Leakage Sealant: When there are leakages created in the hull due to battle damage, the suit automatically injects rubber sealant to damaged components.​ ​

Fighting Style
Hand-to-Hand Combat/Equipment: Due to his large size and advanced structure, Brave Giant is very powerful in close quarters, and Child Emperor will use its very powerful features to quickly finish off his opponents due to the Brave Giant's limited operating time.
 * Divider Shield (ディバイダーシールド, Dibaidā Shīrudo): Brave Giant has an invisible deflector shield that can developed from its arm; it has very impressive durability and is able to withstand Phoenix Man's Phoenix Homing Wing Attacks. It utilizes electromagnetism.
 * Homing Missiles (ホーミングミサイル, Hōmingumisairu): Brave Giant launches multiple homing missiles that lock onto heat signatures. However, they can easily be fooled by fake heat signatures, as seen when Phoenix Man used his Phoenix Flare.
 * Delta Scale Saber (デルタスケールセイバー, Deruta Sukēru Seibā): Brave Giant generates an electromagnetic sword to be used in combat.
 * Mole Mode(地中潜航形態 (モグラモード), Mogura Mōdo): The Brave Giant's severed arm returns to its massive rocket powered drill form in order to gore the enemy with great force.
 * Little Braves (リトルブレイブス, Ritoru Bureibusu): Brave Giant contains multiple miniature Brave Giants that can be used as supportive units in combat. These robots can generate divider shields that are 100 times stronger than normal.
 * All Range Attack (オールレンジ攻撃, Ōrurenji Kōgeki) The Little Braves surround an opponent and attack them all at once with energy attacks.
 * Soccer Shot: The Braves perform a backflip downward kick in order to pass the umbrella shield back to Child Emperor. His Brave Giant mecha acting as the goalie to catch its protected customer.
 * Side Arm Mode (サイドアームモード, Saido Āmu Mōdo): All of the Little Braves combine into a secondary limb replacement for the giant in case of structural damage.
 * Vibrating Sword (超振動小刀, Chō shindō Kogatana): Brave Giant reveals a wrist blade that can vibrate with high frequency to shatter the opponents.
 * Giant Fist Strike (ジャイアントゲンコツストライク, Jaianto Genkotsu Sutoraiku): Brave Giant throws a electric-infused punch. The force of his punch is extremely impressive, managing to corner a dragon-level monster and when used at full-power, manages to actually defeat said dragon-level monster. First used against Phoenix Man.
 * Beam Graver (ビーム 彫刻刀(グレイヴァー), Bīmu Gureivā): An energy Naginata used by Brave Giant
 * Brave Blade Shot (ブレイブブレイドショット, Bureibu Bureido Shotto): Emperor has the giant transform its divider shield into a pentagram form. A pull cord in it's right arm appears for the robot to yank on, turning the star blade into a top like boomerang launcher for a projectile razor disk attack.
 * Gigavolt Smash (ギガボルトスマッシュ, Giga Boruto Sumasshu): Child Emperor uses Brave Giant's maximum output to disintegrate all enemy forces outside the machine.
 * Millenium Emperor Nova.pngMillennium Emperor Nova (ミレニアムエンペラーノヴァ, Mireniamu Enperā Nova): Brave Giant's most powerful attack. It diverts all energy to the arm and vernier, then releases a massive energy beam that punches through every level of the Monster Association base and straight into space.

Trivia

 * Murata believed the previous design of Child Emperor’s robot looked like a mass production model and he wanted something more befitting a main character, so he changed the design of Brave Giant.
 * The Millennium Emperor Nova beam is a parody of the Kamehameha from the Dragon Balls series.
 * Brave Giant's booster is called "U.M.A.I STICK". うまい棒 is a popular kid’s snack. Translated, it means “tasty stick” or U M A I stick.