Asuna Yamase

"Take over the universe? Stick to obnoxious outfits, not obnoxious plots. I'm not letting that happen."

―Asuna, to Gina Spectre

Asuna Yamase
Data
Type	Ally
Gender	Female
Age	19 years old
Family	Father Mother
Affiliation	Xio
First Appearance	Ultraman X episode 1 "A Voice From the Starry Sky"
Latest Appearance	Ultraman X The Movie: Here He Comes! Our Ultraman
Portrayed by	Akane Sakanoue Elise Napier (English Dub)

Asuna Yamase is one of the main characters of Ultraman X. She is a member of Xio.

History

Pre-Ultraman X

Asuna's first appearance.

Since childhood, Asuka has undergone rigorous training in various sports, including swordsmanship and gymnastics, under the guidance of her family. However, during her middle school years, she aspired to become a model and developed a growing fascination with fashion magazines. During a kendo competition, she defeated her first love, which led to him crying and the end of their relationship. This experience left her feeling uncertain about herself and questioning why she couldn’t lead a simple life like an ordinary girl. It was from this turmoil that she developed the belief that "if the world cannot allow a girl to remain ordinary, then it is wrong."

During the summer before she entered high school, her city was attacked by kaijus. Asuka’s father, a police officer, was injured while directing the evacuation of the crowds. Although Asuka’s mother wished for her husband to resign from his dangerous job, her father believed that even if he was injured, he should not abandon his mission to protect the public. He felt that this crucial work needed to be done by someone. Concerned for her father’s safety, Asuka decided to step up, declaring, "If someone needs to do it, then let it be me."

Subsequently, Asuka abandoned her dream of becoming a model and chose to join the Xio Prep Squad for training. Despite this, she still longed for the life of a high school girl, and during her vacations, she would indulge in the typical activities of a 19-year-old. While working at a mountain lodge, she experienced a romance.

In a television interview, Asuka admitted that her decision to join the Xio squad was motivated by her reluctance to let the safety of Earth be controlled by men. She acknowledged that, without joining the team, she might have led a life as a "regular university student, becoming an ordinary girl."

Ultraman X

In the series, Asuna and Daichi participate in missions as partners.

After graduating from her local high school, Asuka joined the Xio as a trainee and quickly earned a promotion to a member of the Special Search Team, demonstrating exceptional skills and becoming an elite team member.

In the team, Asuna is assigned as Daichi Oozora's "bodyguard," becoming his partner. Initially, she feels somewhat resigned to Daichi's frequent independent actions and believes that his dream of coexistence between humans and kaijus is unrealistic. However, when Daichi faces danger, she exhibits a stronger concern and anxiety than other team members. Even in non-combat situations, she frequently shows concern for Daichi. Regarding Rui Takada, due to their similar ages, the two get along well and often interact by imitating Rui's mannerisms and catchphrases.

Asuna witnesses Ultraman X's first appearance.

At the beginning of the series, Asuna participated in a mission as a frontline team member to countermonster Demaaga. During this mission, when Demaaga unleashed a destructive heat ray that devastated the city, Asuna became separated from Daichi. At that critical moment, a giant appeared on the scene. Despite the appearance of the giant, Asuna remained steadfast in her search for Daichi. When Demaaga attempted to attack her, the giant intervened to defend her. As the giant’s combat time was approaching its end, Captain Shotaro Kamiki, recognizing the giant as an ally, ordered the Xio team to provide support. With Xio’s assistance, the giant executed its finishing move, the Xanadium Beam, successfully reverting Demaaga back into a Spark Doll. From that point onward, the giant was known as Ultraman X.^{A Voice From the Starry Sky}

In a subsequent mission, Asuna and Daichi were dispatched to investigate frequent localized earthquakes in a certain area. During their investigation at an underground construction site, they encountered a mysterious woman wearing sunglasses. As the woman made a sound, a kaiju named Telesdon suddenly emerged from below the ground. Following the monster sighting alert, the Xio team deployed the ground combat mecha "Xio Musketty." Asuna's special vehicle, "Xio Porthos," combined with it to form the "Land Musketty". Despite Asuna's use of the powerful "Fanton Rail Cannon" attack, Telesdon managed to escape.

Asuna confided in Daichi about her past and her determination to embrace her feminine side.

Further investigation by Xio revealed that the mysterious woman, identified as Ryoko Mabuse, had previously operated a beauty salon but had died in an accident two months prior. Asuna and Daichi, posing as a couple, infiltrated the beauty salon for a covert investigation. When Ryoko realized their intention to uncover her identity, she fled immediately. Daichi was knocked unconscious by her, and while Asuna pursued her, she was shot at. Although Asuna managed to evade the attack, her newly purchased high heels were destroyed, which ultimately allowed Ryoko to escape.

After the events, Asuna was reprimanded by Vice-Captain Sayuri Tachibana for wearing high heels during a covert mission. However, Asuna confided in Daichi that she was reluctant to give up her feminine charm due to past experiences. At that moment, another earthquake occurred. Daichi and Asuna confronted the mysterious woman once again on the streets at night. The woman pointed to the city lights and declared, "Humans are trying to take the night from us," and summoned Telesdon once more.

Telesdon began to wreak havoc on the city. Daichi merged with Ultraman X to engage in battle. However, Ultraman X found himself at a disadvantage in the confrontation with Telesdon. At this critical juncture, the Xio team arrived and deployed their new weapon, the Ultlaser, to support X in the fight. Ultimately, X equipped the new "Eleking Armor," a monster-themed armor, and defeated Telesdon, successfully safeguarding the city.

Subsequently, the mysterious woman, still wearing sunglasses, reappeared and attacked Asuna. However, she eventually vanished following a counterattack by the Xio team. The incident was resolved, and a few days later, Asuna celebrated her birthday, receiving a new pair of high heels from her teammates as a birthday gift.^{A Song That Calls the Night}

During a mission to counter second Demaaga, a mysterious energy from space caused Demaaga to evolve into Tsurugi Demaaga. Concurrently, Ultraman X was affected by this unknown energy, causing his body to disintegrate and rendering him weak. Asuna and her team went to investigate the site of Demaaga’s appearance but encountered a mysterious woman. This woman, identified as Gina Spectre, revealed that she was using the energy to enhance Demaaga with the aim of dominating the entire universe. Gina then summoned Zaragas from the Spark Dolls and promptly vanished. Asuna requested support from Xio, but at that moment, Tsurugi Demaaga reappeared on the streets, putting the situation in a dire state.

Dr. Gourman suggested using Daichi's Gomora and provided Asuna with a Cyber Card. Although it was uncertain whether Asuna could operate Cyber Gomora, the creature successfully materialized. Asuna then engaged Zaragas in battle and ultimately used the Cyber Ultra Vibration Wave to revert Zaragas back into Spark Dolls.^{End of the Rainbow}

Asuna and Arisa work together in battle.

When the UPG members were transported to X’s world, Asuna made a friendly contact with Arisa Sugita. Due to their shared expertise in hand-to-hand combat and similar ages, they became partners. Together, they assisted X, Victory, and Ginga in fighting against Mold Specter. Hayato and Wataru noted that there was a similar aura between them.^{Sword of VictoryThe Shining Sky, and the Land Beneath It}

During a test conducted by Xio to materialize Daichi’s Gomora from the Spark Dolls, a protective barrier was established to guard against potential Dark Thunder Energy surges from a rampaging monster. The test was set with a three-minute time limit. Throughout the test, Gomora successfully materialized and responded to Daichi’s commands, allowing for effective communication. However, as the time limit expired, a powerful surge of Dark Thunder Energy pierced through the protective barrier, causing Gomora to transform into EX Gomora and go berserk. Despite Daichi’s transformation into Ultraman X to combat the rampaging EX Gomora, he was quickly captured by M1.

Witnessing Gomora's rampage, Asuna was determined not to kill the creature. Ignoring her own safety, she tried to awaken its consciousness.

Unable to stop EX Gomora's rampage, Xio decided to destroy EX Gomora. Observing this situation, M1 declared that humanity’s inability to coexist with others would lead to its extinction. At that moment, Asuna stepped forward on her own and pleaded with EX Gomora to cease its rampage. Despite her efforts, EX Gomora continued its onslaught, and Asuna narrowly avoided being trampled. Despite her injuries, Asuna persisted in her pleas. Meanwhile, the horns of EX Gomora began to glow.

Moved by Asuna's desperate actions, M1 snapped his fingers and transported Ultraman X back to Earth. Using the X Barrier Wall, he blocked the attack and saved Asuna. Ultraman X then successfully employed the "Exceed X Slash" from his Exceed X skill to revert EX Gomora back to its original Gomora form. Subsequently, Ultraman X attempted to use the Xanadium Beam to transform Gomora back into a Spark Doll. However, Gomora’s body began to emit light, and before the beam could reach it, Gomora transformed back into a Spark Doll on its own.

Witnessing the bond between Xio and Gomora, M1 remarked that if humanity cannot learn to coexist with others, it will ultimately face destruction. M1 then resumed his monitoring of Earth and humanity.^{Living Together}

After Daichi heard the voice of his missing mother, he went to investigate the research facility believed to be the source of a temporal anomaly. He conducted the investigation without rest for three consecutive days, which caused concern for Asuna, who urged him to take a break. Meanwhile, Xio received a report from the UNVER Geneva headquarters, indicating the detection of Dark Thunder Energy near the solar system, which was known to induce extreme aggression in monsters.

While Xio reviewed footage from Wataru and Mamoru Mikazuki's patrol near the Moon, it was observed that the glowing entity was the result of a human brain being forced to visualize a state of "nothingness," or complete non-existence. This explained why the true source of the Dark Thunder Energy could not be pinpointed. The glowing entity then flew to the UNVER Nevada branch and destroyed the base.

Asuna witnesses the moment Daichi transforms into Ultraman X.

Ultraman X subsequently contacted Xio through Daichi’s X Devizer. It was confirmed that the glowing entity was actually Greeza, which could absorb planetary biological energy and convert everything into nothingness. The Ultra Flare incident 15 years ago was, in fact, the result of a battle between X and Greeza. With Grieza approaching Operation Base X, which stored numerous Spark Dolls, X requested Xio’s collaboration. A joint offensive between Xio and X was launched, but Grieza breached their defenses and landed in Japan. Prompted by X, Daichi decided to merge with X in front of Asuna. This revelation shocked Asuna, who then informed all Xio members that Daichi was indeed Ultraman X.^{A Beautiful End}

However, Greeza’s intangible form rendered X’s attacks ineffective. Daichi and X attempted a desperate assault, trying to attack Grieza from within. Although Greeza exploded, only X's color timer emerged from its remains. Asuna approached the remaining color timer, touched it, and heard Daichi's heartbeat, thus confirming that both Daichi and X were still alive. Dr. Gourman proposed a plan to send someone into X's cyberspace for rescue.

Asuna's consciousness comes to Ultraman X's cyberspace.

To save Daichi, Asuna voluntarily undertook the mission. Meanwhile, Grieza, though previously damaged by Ultraman X's attacks, was in the process of regenerating and resuming its destructive activities. As Xio's team engaged in efforts to halt Greeza, Asuna's consciousness was transferred into X's cyberspace, where she embarked on a desperate search for Daichi. During her search, she encountered the Xlugger.

Despite her best efforts, Asuna struggled to locate Daichi within the cyberspace. In a moment of emotional vulnerability, she expressed her deep feelings for him, admitting that she had always felt a responsibility to protect him, a belief that had motivated her actions thus far. However, she came to the realization that Daichi had, in fact, been the one protecting her all along. Due to Daichi's unwavering determination, Asuna expresses her resolve to join him in pursuing the dream of coexistence between humans and kaiju. However, she understands that a dream without a future is unattainable. If they do not resist now, all hope for the future will be completely lost. Even as her brainwave levels approached dangerous thresholds within the virtual space, Asuna refused to abandon her search for Daichi.

Under the power of Xlugger, Asuna and Daichi reunited in cyberspace.

Ultimately, through the power of Xlugger, Daichi responded to Asuna's heartfelt call and regained consciousness. With Asuna's help, Daichi was able to channel the power of Ultraman X's memories and emotions, successfully leading to the revival of Ultraman X. Reenergized, Ultraman X, with support from the Xio team, launched a final offensive against Grieza. X managed to destroy the core inside Greeza's chest, which caused the release of the kaijus that had been trapped within Greeza’s Spark Dolls. These kaijus then merged with Ultraman X, enabling him to don the Hybrid Armor. With this new power, X deflected Greeza’s attacks and unleashed the Ultimate Xanadium Beam, delivering the decisive blow and finally defeating Greeza.

After the battle, Asuna and Daichi are reunited, and together with the rest of the Xio team, they begin the process of rebuilding their base.^{The Rainbow Land}

Powers and Weapons

• Peak Human Condition: Asuna is a skilled martial arts practitioner due to her past being taught self defense by her father.
• Piloting: Asuna is a skilled driver in heavy vehicles like Xio Porthos and Land Musketty.

Gallery

Ultraman X

Ultraman X The Movie: Here He Comes! Our Ultraman

Miscellaneous

Asuna Kicking Alien Zarab

Trivia

• In an interview, Akane Sakanoue recalled feeling that the six-month filming schedule would be long. One of her most memorable moments was on the third day, during an explosion scene where she had to run as it went off behind her. After practicing the running motion repeatedly, she struggled to run smoothly, but in the actual take, she completed it in one shot. The exhaustion and breathlessness seen in the scene were her real reactions, not just acting.
• Sakanoue, who practiced taekwondo with her brother during her childhood, was praised by Hiroyuki Okano, the action director for the series, for her impressive kicking technique during filming.
• During the filming of the series, since Sakanoue had not yet obtained her driver's license at the time, all scenes involving driving were performed by a stunt double.
• In the series, Ultraman X often makes unintended but poorly timed comments regarding Asuna's weight, age, and diet.