Mozu is a tall, muscular young man wearing pauldrons that appear to be made of stone. His stone guards were destroyed during his fight with Hyoga. He is shown to have replaced them while in America.
When posing as an invader, he wore a a black cloak and different outfit. 
He has dark dreadlocks that are tied into a low ponytail. He has facial markings of unknown origin that extend from the top of his eyebrows in a curl, to between his eyes, similar to Kirisame's.
Mozu is a cocky, adventurous and easygoing man who enjoys the company of beautiful women, and strong people. He giddily looks forward to the harem selection every year, hoping for cute women to appear. He becomes fascinated with Kohaku upon meeting her, due to her combination of strength and beauty, two things he appreciates greatly.
He enjoys this fun to a fault, allowing Kohaku into the harem despite her nearly breaking Minister Ibara's hand. Even in the past, he lamented having to petrify the young escaping Amaryllis, recognizing how beautiful she could potentially be in the future. He also showed attraction to Luna, immediately commenting on her beauty.
Despite all this, he possesses a sharp instinct and is cunning, and it is hinted that he knows a lot more than he lets on. Another glimpse of this is when he reminded the enemy that they were shorthanded and it would be best for them to not kill him and his friends because they were needed. This caused the Perseus crew to note that while he is cruel, he is strangely intellectual about such a topic. Minami correctly describes him, as "selfish, strong as an ox, and calculating to boot" with Kirisame adding on that he is "the last person you'd want to make as an enemy, but a surprisingly reliable ally.
In battle, he lives for the thrill, as seen when he fought against Hyoga who he found to be a worthy adversary. Even after being defeated, he showed himself to be a good sport and even asked his victorious opponent to give him lessons. He will also show respect to fellow warriors, as seen when he complimented Matsukaze for holding off the grenades.
Abilities and Skills
Mozu is a highly competent fighter, serving as one of the two greatest warriors of the Petrification Kingdom.
- Enhanced Strength: He was able to easily throw aside five men (including Oarashi) with his strength alone, and was able to effortlessly overwhelm Kohaku with his skillful spearman-ship (Although she was not armed with her typical weapons at the time.) He also defeated Kinro, Magma, and Nikki in one blow each. He and Kirisame are noted to be the strongest warriors of the Kingdom of Petrification. The true depths of his strength are shown when he lasted very long against Hyoga before he was defeated. He could hunt and kill large American Alligators with help from the others. Mozu also defeated several members of Stanley's military unit, despite their years of intense training.
- Stealth Prowess: Mozu was able to sneak up on Senku and his friends. Even with Ukyo's superlative hearing, he snuck up on them without detection.
- Intelligence: Mozu was able to deduce that Kohaku was one of the intruders, although he chose to withhold this information, due to his personal interests. He also knew that the military unit led by Stanley needed more people for the castle and reminded them of that as a way of stopping them from attacking.
- Spear Master: Mozu is a spear-handling master, using his skill, he was able to defeat several warriors of the Petrification Kingdom, such as Oarashi. He was even able to overwhelm Hyoga until the latter was able to modify Kinro's spear into that of Kudayari spear, and defeat him with his Kan style. During the time in America, Mozu has learned some of the Kan style and defeat some of Stanley's military unit with it. He noted on how far his skill got with actual training, describing it as incredible.
|Battle Ability||5/5 A|
|Work Ethic||1/5 E|
|Love Prowess||5/5 A|
He hails from a family of warriors and was blessed with extreme warrior talent. At the young age of seven, Mozu nearly committed patricide when driven over to strike his abusive father and slamming the latter away. He has not lost a battle since then.
Five years before Senku came to Treasure Island, Mozu and Kirisame were on a boat and found a group of kids including Amaryllis trying to escape the island with their boat. Kirisame petrifies all the kids with her weapon but Mozu tells her to not petrify Amaryllis because of how she can be cute in the next 5 years.
Mozu attends the harem selection and notices Kohaku's strength.
He later finds out Kohaku is an invader and fights her.
Mozu comes into terms with Senku of a plan to take the petrification weapon and fight Ibara. Mozu plans to dominate everyone on the island after taking the petrification weapon. Disguising himself as an invader he proceeds to attack other warriors under the guise of being mysterious.
The next day, Mozu watches Oarashi reveals an invader attacked him. He internally comments to himself on how the latter is perceptive when comparing his strength to a supposed invader. Mozu soon recalls Gen advising him to attack a braggart who would tell the others and make himself look well.
Startled to see someone revived from stone, Mozu stops in his tracks to understand the events. Soon he stops Magma from pursuing Ibara, as Hyoga questioned him on his intentions after revealing his views. Mozu tried to sway him into allying with him but subtly thought of betraying him. Ultimately Hyoga declines the offer, before stopping Mozu from killing Senku. The two go onto fight on the ship and are equal for some time.  
During the battle, Mozu believes he's gotten the upper-hand and taunts him, though Hyoga dives in the water, something that Mozu realizes. He pursues Hyoga who is seemingly running away, only to learn its a trap. Hyoga modifies Kinro's spear to better fit his Kan Style to fight better. Mozu tried to defend himself from Hyoga's new fighting style but was overwhelmed and defeated.
When the island was being engulfed in petrifaction beam, Mozu remarked on how fitting it was that his first loss was in the last battle he had. He and Hyoga promised if they'd ever be freed, they would spar again and would like to learn more from each other. He, along with Hyoga and everyone else on the island (with the exception of Senku) was petrified by Ibara.
It is revealed Mozu's statue was taken by the Kingdom of Science. When Hyoga agreed to join the Kingdom, he requested Mozu be revived. After being depetrified, Mozu is part of the combat team, sparring with Tsukasa, Matsukaze and Hyoga, excluding Kinro and Ginro who trained elsewhere.
When the Perseus arrives in San Francisco, the warrior team follows the exploration crew. Soon alligators attack, though Mozu and the other warriors defeat them and use the Alligator meat to restock on supplies. 
When a girl named Luna arrives, Mozu is in awe at her beauty, while Kirisame berates him for being focused on her looks. While the rest of the crew discuss their suspicion of Luna, a love struck Mozu states that she is cute and there is nothing to worry on.
Staying below decks while the ship came under attack, Mozu was confronted by an enemy soldier who threatens him. Not afraid of the gun, Mozu defeated the soldier before he is joined by Ginro and Matsukaze who avoided capture. Mozu tells his defeated foe that while his weapon may scare modern timers, he and the other island warriors do not know their rules. 
Mozu and Matsukaze made their way to the deck, where they proceed to battle the enemy. Using his spearmanship, he easily knocks away several enemies. He notes that training Hyoga taught him came in handy. When the enemy fire is grenades he is briefly worried until Matsukaze knocks them away. Mozu compliments him on his skill before he warns the enemy that if they need more people then they should not kill them. Although their strength proves troublesome to the enemy, Stanley emerges from the submarine and catches the Warriors off-guard. Mozu tries to attack Stanley but is dodged before Stanley shoots Mozu's spear, destroying it and hitting him in the shoulder. Stanley reports the enemy was defeated. 
Mozu has recovered from his injuries and was present when Joel completed the Petrification Weapon. Mozu noted that Joel's watch that has a wiretap is similar to the earring from Treasure Island, and that he's been trading information with the other group on how to build the diamond batteries. After Senku sends a message to fight, a pleaded Mozu remarks he was tired of playing nice and with everyone else lunges at the armed soldiers.
They met during the harem selection. He was impressed by her skill, stating she was strong but declared his status as strongest and engaged her battle nonetheless. Kohaku was in awe at his skill, especially when he easily overwhelmed her and he offered her the chance to be with him if she gave up her friends. However, she refused the offer but the battle never reached an outcome, as Kohaku was petrified.
At first, he was amazed at Hyoga being revived from stone. He wondered if Hyoga was a strong opponent. When Hyoga questioned him on his intentions after revealing his views, Mozu tried to sway him into allying with him but subtly thought of betraying him. After his offer was refused, Mozu wasted no time in engaging Hyoga. In the fight, Mozu noted Hyoga was the first warrior to get him to struggle. After Hyoga won, Mozu gave a sign of acknowledgement for his skill because it was his first battle he lost. When the island was being engulfed in petrifaction, Mozu and Hyoga promised if they’d be freed that they would spar again. During Hyoga's revival, he requested that he gets to revive Mozu and they finally got the chance to spar.
- His name Mozu is the Japanese word for Bull-Headed Shrike, which is a bird that impales its prey on thorns.
|Male||Head of Petrification Kingdom • Ibara • Matsukaze • Mozu • Oarashi • Soyuz|
|Female||Amaryllis • Kirisame|
|Alabaster • Argo • Carbo • Chrome • Ganen • Genbu • Ginro • Hagane • Jasper • Kaseki • Kinro • Kokuyo • Magma • Mantle • Natri • Sagan • Sho • Tetsuken • Titan • Unmo|
|Alumi • Azura • Beryl • Dia • En • Garnet • Kohaku • Kujaku • Namari • Ruby • Ruri • Sango • Sapphire • Shirogane • Shovel • Suika • Suzu • Turquoise|
|Soyuz's father • Ibara • Matsukaze • Mozu • Oarashi • Soyuz|
|Amaryllis • Kirisame|
|Male||Chrome • Gen Asagiri • Ginro • Hyoga • Kaseki • Kinro • Kokuyo • Magma • Matsukaze • Mozu • Ryusui Nanami • Senku Ishigami • Taiju Oki • Tsukasa Shishio • Yo Uei|
|Female||Homura Momiji • Kirisame • Kohaku • Minami Hokutozai • Nikki Hanada • Ruri • Suika • Yuzuriha Ogawa|