Diego Carlo (ディエゴ・カーロ) is the Lucha Libre Master and Smiling Steel Fist/Angry Iron Fist of Yami's One Shadow, Nine Fists and was the master to Rachel Stanley.
Appearance
Diego is a tall muscular man with long black hair he keeps slicked back. He usually wears a dark red Lucha Libre wrestling outfit and his laughing mask to show off his happy-go-lucky attitude.
When he fights seriously, he removes his smiling mask to the angry mask to look very angry and no longer smiles. Under his mask is a sunglass mask to cover his eyes (possibly because he's too embarrassed to show his eyes without his mask on).
Personality
Diego is primarily known as the Smiling Steel Fist in the Nine Fists due to his flamboyant and goofy personality. He believes that a fight must always have an audience and that the fight is for the audience's enjoyment, and that after a fight the loser must obey the winner. He has been shown to always be smiling or laughing even when angry. This personality seems to have rubbed off on his disciple. It's very rare to not see him smiling in a goofy or relaxed manner, as when he frowns is usually when he's upset by something or angry with his opponents. He also seems to care greatly for his disciple, Rachel. One of the few times he frowned was during his imprisonment in Big Lock while wondering if she missed him. He even pictured her crying while holding his mask. He also has a liking for manga, as he was seen reading one while in Big Lock and was glad his favorite one is still going on.
Despite his tendencies, Diego is also shown to be cunning, as shown when he matches up Garyu X with the Muay Thai Taifun team, which secretly had a 51-year-old master in its ranks. During the fight, he pretends not to realize the elder's true identity and enjoys toying with the information when presented with the truth. It is revealed that he lied to the elder about the tournament being for people "20 and under", when in fact the tournament was for those "under 20", possibly as a measure of insurance for invalidating the elder's future battles in the D of D. This takes on a grimmer tone when he places the targets he was sent to assassinate on a ship and fights with Kensei Ma while on the ship, caring not for the wellbeing of those people or the fact that blowing up the ship would send him into the sea as well.
Despite his cunning and goofiness, Deigo does have some honor, as he gladly accepted his defeat at the hands of Ma Kensei and willingly gave him his mask and went to Big Lock.
Skills
As a member of One Shadow Nine Fists, Diego is a very powerful fighter. With his dedicated showmanship, he can completely change his demeanor from the goofy show-off of Smiling Mask, a Sei-type, to the raging battler of Angry Mask, a Dou-type. With his Lucha Libre fighting style and his ability to maneuver so well, he makes him a tricky opponent. A testament to his skills is that he, along with Alexander Gaidar, is capable of escaping Big Lock with little effort and can do so at any time they feel like it.
- Master Luchador: Diego is a master practitioner of Lucha Libre, a style that uses powerful techniques, but is ultimately difficult to use in real combat due to its flashy, time consuming, aerial-based, tackling nature of fighting. As a master of this fighting style, Diego has honed his skills in all of these types of fighting techniques and has mastered them to the point where he can effortlessly use these techniques in battle despite the overall uselessness Lucha Libre has in real close combat situations. Because of his mastery of this fighting style, Diego is an incredibly complex and unpredictable fighter, and can outmaneuver some of most versatile of fighters, which was proven during his fight with Kensei Ma as he had him on edge during most of the fight, and was so difficult to fight against that Kensei admitted that he couldn't hold back against him anymore if he wanted to win.
- Immense Speed: He was able to move fast enough to make clones of himself. He even managed to sneak up behind Kensei once while both combatants were in the air and delivered a blow to Kensei's neck.
- Enhanced Strength: As a master class fighter and a member of Yami he has above average strength. He is capable of breaking a microphone with just his jaw and tearing through hard stone with little effort.
- Immense Agility: He is extremely agile and can keep most opponents in the air while attacking with many different techniques. Because of his Lucha Libre fighting style, he manages to make sure his opponents don't get a hold of him in the ring. Diego can even maneuver his body out of an opponent's attack before the full force of the blow connected. He pulled this once on Kensei at the end of their fight and managed to grab ahold of Kensei when the latter had barely finished his moves.
- Iron Defense: Arguably to be the essence of Diego's style, instead of dodging his opponents' attacks he shrugged them off with his enormous defense and continued on with his attacks. He took one of Kensei's signature techniques and was unfazed, which according to Kensei and Renka should have toppled if not killed him, let alone standing. Only when Kensei used techniques that are meant to injure the opponent's interior did he suffer any significant injury. His arm can go through a high shocking voltage electric fence without taking any damage.
- Master Entertainer: Diego is a master of entertaining people as he is easily able to entertain large numbers of people, and he always does it with pride. As an entertainer, he is incredibly proud of his "Diego Quality" brand of entertainment and is willing to go to great lengths to turn every important event into a show. He has shown that he is able and willing to use his entertainment as a form of deception. This was proven during his battle with Kensei as he revealed that his audience were really just targets, and that his real audience were watching everything via surveillance from several miles away from the ship on boats. Despite this, his dedication to showmanship is iron-clad, as even though he lost to Kensei Ma, he did so while ordering his disciple to continue pointing the cameras at him, and even went as far as getting himself and Kensei into a position where all the cameras are right on them, so his audience could see his performance to the very end.