This is a list of characters for the 1974 Ultra Series Ultraman Leo.

Protagonists Ultraman Leo is the titular protagonist of his series, who took on the appearance of 20-year-old and worked as an instructor of Jonan Sports Center. In contrast to the previous Showa Ultras, Leo's home world was the instead of Land of Light in Nebula M78.

Leo was one of the survivors of his home world's destruction by the hands of Alien Magma and his Giras monsters. Ever since adopting a human identity, Gen views Earth as his second home and committed to defend it no matter the cost. Having rescued Seven from Alien Magma, Gen was enrolled into MAC as their seventh member and took over the former's mission to fight against monster threats. Despite his new job, Gen was still permitted to visit Jonan in his free time. Being an Ultraman in disguise, Gen displays excellent body performance and senses but due to his young age, he is prone to make irrational decisions and would even pick a fight with others. However, Gen builds up a character development as the series progressed thanks to his interaction with humans and training provided by Dan, as well as protecting Earth while maintaining friendship with MAC members. By the time MAC was annihilated in episode 40, Gen and Toru live with the Miyama family as they team up to investigate Saucer Monster attacks through his previous experiences. By the end of the season, Gen bids farewell to Toru as he left traveling on a yacht.

As Ultraman Leo, Gen transforms with the on his left hand. Being an Ultraman from another world, Leo's time limit on Earth is 2 minutes and 40 seconds, while his abdomen bears the that functions as coat of arms for L77 inhabitants. As an Ultraman who uses , Leo's main finishing move is , a flying kick attack with multiple variations of it shown in the series progress. He can also perform beam finishers, such as , and . He can also wield weapons in combat: : A bracelet that allows him to utilize a syringe in episode 18. : A nunchaku created from factory chimney through his innate powers. Used once in against Alien Kettle. : The mantle worn by Ultraman King, given to Leo ever since their fight with Pressure. The cape can transform into umbrella shield and to escape Alien Mazaras' mirror world.

Gen Ootori is portrayed by .

Tooru Umeda is a 10 year old recurring character who eventually becomes the supporting protagonist. One of the students of Jonan Sports Center, Tooru views Gen as an older brother, especially after being orphaned by Alien Tsuruk and was adopted by Momoko alongside his younger sister Kaoru. With Kaoru and his friends from Jonan Sports Center were killed by Silver Bloome, Tooru lives with the Miyama family. The loss of his family members and his close friends nearly drove Tooru to the point of despair, which Nova exploited but slowly moves on with Gen's moral support. In the final episode, Tooru discovered Gen's identity as Ultraman Leo and was held captive by Commander Black as a leverage for Leo in against Black End until several children that Gen tutored freed him as they beat Commander Black to death. Tooru bids farewell to Gen as they parted ways.

Tooru Umeda is portrayed by .

MAC The , abbreviated as , is an attack team which succeeded the . The floating headquarters are , operating above the major cities of United States, Europe, Africa, and Asia. The series' main setting is the Asia branch of MAC, but whereas there are multiple MAC operation bases on Japan, Dan Moroboshi commanded the . Differing from past attack teams, there are multiple replacement officers and those who were killed in duty. Eventually in episode 40, all officers except Dan and Gen were killed when Silver Bloome destroyed the Asia branch MAC Station.

Early members With the exception of Dan and Gen, all officers that debuted in episode 1 had their names revolved around the Japanese words for colors. Dan Moroboshi: See below Gen Ootori: See above : Aged 24 and the first sub captain of MAC Asia branch. He specializes in engineering and was seen remodeling Maccy's engine. Despite being at odds with Gen, he also shows a supportive side towards said junior. He is portrayed by . : Aged 22. He is a combat expert and faithful to his mission but is prone to intense emotions in battle. Likewise, he also clashes with Gen but shows occasional supportive attitude in later episodes, to the point of both practicing Karate with several children. He is portrayed by . : One of the early members who specializes in mechanics and always went with Kuroda to repair Maccy fighter jets. While usually expressionless, he had once doubted Gen's intuition when they were patrolling in Kuroshio Island. He is also a capable fighter and had once wielded a large MAC Blaster. He is portrayed by . : Aged 18, she is the operator of MAC Station and rarely ever went into battle. She is portrayed by . : Aged 20, she is the only early members aside from Dan and Gen to make a recurring appearance in the series. Aside from being a communication officer, she can also descend into aerial combat. When Silver Bloome attacked the MAC Station, Shirakawa tried to escape on a Maccy fighter jet but was killed as well. She is portrayed by .

Later additions : The next sub captain who replaces Kuroda, he is a formidable fighter despite his stoicism. He is portrayed by . : The final sub-captain, replacing Atsushi in the previous episode. Despite being older than Dan Moroboshi, he is friendly with other members. Daisuke was among those killed in Siver Bloome's raid on MAC Station. He was portrayed by . : Aged 22 years old, he started as a guest character in episode 6 before making recurring appearances since episode 17. An officer who is proficient in the use of MAC Gun. When his girlfriend was killed by Alien Karly, Jun blamed Gen in his failure to protect her. Jun was among the victims of Silver Bloome's attack on MAC Station. He is portrayed by . : The replacement officers for Aoshima and Akahashi, who piloted Maccy 2 and/or 3 during combat. He usually works with Gen and Shirakawa and was among the victim's of Silver Bloome's attack. He is portrayed by . : Momoi's replacement as the operator, who occasionally gets into the battlefield. Silver Bloome's attack on MAC Station occurred during her birthday celebration and was killed in an attempt to escape. She is portrayed by . : The replacement operator in between Momoi and Matsuki. She is portrayed by .

One-off members : A MAC member who agreed to adopt Tooru and Kaoru after losing their father but his wish is cut short when Suzuki was killed by Alien Tsuruk. He is portrayed by . : A cheerful adventurer who recently returned from Africa, he volunteered as an honorary member of MAC to counter the threat of monster Bungo. After the fight, Satō parted ways as he left for Himalayas. He is portrayed by . : A former skier who saved Alien Alpha from Northsatan at sometime prior. He fell in love with the female alien but she left the Earth right after his right foot's operation. He is portrayed by . : An officer, who despite his good relationship with Dan, is willing to commit hasty decisions, such as destroying the Planet Ultra when it was about to go on a collision course with Earth. He has a daughter named Ayako. He was portrayed by .

Arsenal Uniform: The standard uniform of MAC members consist of two-piece and . In early episodes, female members were shown wearing beret as male members wear in the field, which connected to their communication devices. : A wristwatch that can detect a monster's presence. Even after MAC's demise, Gen still wear it in episode 42. : A handheld pistol with changeable cartridges to different firepower, such as laser and grenades. : A bazooka used to attack Alien Babarue. : An atomic heat gun with 60,000 degree heat firepower. : A medium-sized gun with built-in accuracy system. : A combat knife made from manganese steel. First used in episode 11 but was exploited by Alien Vaib two episodes later with Gen framed as a result. : A camera that Dan used in episode 13 to uncover Alien Vaib's disappearance technique.

Mechas and vehicles Aircraft : A large spacecraft that moves with the 0.4 times speed of light. Its only appearance were episodes 1, 3 and 40. Although Maccy 1 had its engine retrofitted in the height of Alien Tsuruk's assault, it never went into action again. The jet was among those eaten by Silver Bloome during its assault on MAC Station. Although never shown again in the series, supplementary materials reveal that it was repurposed as a cargo aircraft from Earth to MAC Station. : A medium jet which always assigned with Maccy 3, it can separate into two different jets, Alpha and Beta. It was among those eaten by Silver Bloome and forcefully pulled out by Leo in battle. : A fighter jet which Dan usually rides. He also used it to defeat Alien Vaib by ramming into the alien on a kamikaze attack before Leo saved him. It was among those eaten by Silver Bloome and forcefully pulled out by Leo in battle. : A helicopter that appeared in episode 27, its original prop was repainted from ZAT Dragon in Ultraman Taro. It was used to deliver a peach-shaped capsule to Oni-on. : Space fighters used to intercept Satan Beetle in episode 25.

Vehicles : An eco-friendly jeep for patrol and combat purpose, powered by a nuclear engine. Equipped with , and a time bomb. : A standard patrol car with no armament. : Patrol jeeps. Different models appear depending on the episode, either an Isuzu Unicab (episode 6) or Mitsubishi J3/J4 (episode 39).

Others Note: Neither of these vehicles were used in-story. : A subterrene which is only mentioned in MAC no March insert theme. : A submarine which was only mentioned in episode 19 and appeared in the opening of episode 28, but saw no actual combat history.

Other main characters Jonan Sports Center is a private organization that promotes sports, with Gen taking the job as an instructor. Although Gen's close friends have died in Silver Bloome's attack, Jonan Sports Center still exists and Gen still maintains his job until the final episode. : The chief of Jonan Sports Center. He was portrayed by . : Gen's girlfriend, who becomes the caretaker of Tooru and Kaoru after they were orphaned by Alien Tsuruk. She was among the casualties of Silver Bloome's attack on Shinjuku department store. Her hometown was the , the place where Alien Magma and Giras Brothers started their attack. She is portrayed by . : An assistant instructor who aspires to join MAC. He often views Gen as an older brother figure but also served one for the Umeda siblings. He has a childhood friend Reiko, who works as a gymnast in the Sports Center. He was among those killed in Silver Bloome's attack on Shinjuku. He is portrayed by . : Tooru's younger sister. She died in Silver Bloome's attack on Shinjuku. She is portrayed by , who is currently a voice actress working under the stage name .

Miyama family : A nurse director that allows Gen and Tooru to take refuge in their home after losing their friends to Silver Bloome. She was once kidnapped by Bunyo as a bait for Leo. She is portrayed by . : A Jonan University student and the oldest sibling of Miyama family. She is portrayed by . : The youngest sibling of Miyama sibling and Tooru's classmate. She is portrayed by .

Other Ultras Ultraseven Returning from his titular series, is the third member of the Ultra Brothers who reassumed his human alias while leading the Space Patrol branch of MAC, therefore becoming Gen's closest ally and confidant during his active period as Ultraman Leo.