Mio Kusanagi/Evil Universe

"“The club members that went to subjugate the giant toads went missing around here…”—Mio"Mio Kusanagi (草薙ミオ) is the counterpart of the Vice President of the Exorcism Club in the Evil Universe who went to investagate the disappearance of her fellow club members during a routine "clean up" mission in the sewers. Mio would suffer a fate worse than death after she falls victim to one of Mikoto Kiryuu's creations: a Jinmen Giant Toad.

Appearance
Mio was a very curvaceous woman with a big bust, large thighs, and wide hips. She has dark blue hair that she normally keeps in a hime-cut and ponytail. In colored illustrations, her eyes have been depicted as either red or blue. She would usually have a serious expression on her face. Mio often can be seen wearing her school uniform.

After being assimlated by a Jinmen Giant Toad, all that can be seen of her original human body is her face that trapped on the back of the monster. While in this state, Mio would frequently give a lustful, yet tortured expression. During the stages where she is forced to be have an "egg" or "tadpole" as a host, Mio's face would be covered in a thin membrane until the toad fully matures.

Personality
Mio is described to be a very serious and responsible individual that likes to keep things organized and orderly. She is usually the one to pick up the slack if her club members shirk their duties. Despite her cold exterior, Mio deeply cares about her fellow club members, and would go out of her way to assist them if they ask for her help. Ironically, Mio's affection for her friends would be her undoing as she hesitated to kill the Jinmen Giant Toad after seeing their faces on the monster's back, resulting in Mio herself being devoured and assimilated.

When confronted by the mad scientist Mikoto Kiryu, Mio pleaded with Mikoto to unfuse her friends from her monster so that they can have their lives and freedom back. Mikoto pointed out Mio only begged for friends' lives but not her own, showing how much she values their well being.

After going through several "life cycles", Mio left in a state of near catatonia and has given up all hope of being free of the Jinmen Giant Toads. According to Mikoto, during her moments of coherency, Mio would express her desire to be put out of her misery and her hatred for Mikoto.

Mahou Kaiju Manga Anthology Special
The Evil Universe version of Mio went through the same events as her Main Universe counterpart, up until she noticed that many of the exorcism club members have mysteriously disappeared during their routine missions of "cleaning up" the sewers of low-class demons. Eventually, the club has lost most of its members. Although "clean up" duty was not required for members of higher positions, Mio decided to investigate her friends disappearances on her own.

Investigation in the Sewers
Mio spent several hours in the sewers kill away demon she came across, mostly giant toads. Much to her confusion, none of the demons she encoutered possed a serious threat to her, although there was an unusually high number of evil monsters in the sewers. Mio would eventually reach the section of sewers where most of the club's member went missing when she is suddenly attacked by a particularly stealthy giant toad. Having sensed the demon, Mio was just barely able to avoid the toad's tongue. The exorcist leaped on the roof of the sewer system and is prepared to strike the toad's back but sees an unnerving sight: the faces of her missing friends poping out of the monster's back.

Being Assimilated by the Jinmen Giant Toad
Shocked by the unusual state of her fellow club members, Mio couldn't help but take a few moments to look at the unslightly faces of her friends as they seem to be wallowing in pleasure. However, Mio's few seconds of hesitation would seal her fate, as the giant toad used its tongue to latch onto Mio's ponytail and then pull the girl into its mouth. Curse herself for her mistake, Mio made a last ditch attempt to channel the demon's spiritual energy to make it explode, but it was too late. The giant toad used its tongue to pull Mio down its throat. Mio was assimilated into the creature, and her face would pop out in the center of the creatures back. Several of the exorism club would look on in horror at the sight of their defeated vice president. Mio would suddenly find herself being bombarded with the intense feeling of orgasmic pleasure, and joins her assimilated friends in their cries of ecstasy and despair. She would spend several days on the back of monster, hoping someone would come save her and the other club members. Although for some reason, no one else came down into the sewers. One day, she can sense the toad being called to a remote location. Eventually, the demon reached its destination: a hidden underground labatory. There Mio sees the person responsible for her torment, the elder sister to the "Devil's Doctor": Mikoto Kiryuu.

Mikoto Kiryuu and NOMAD
Mikoto welcomes back her creation and is happy to see its "eating well". She began to thoroughly exam the faces on the demon's back. Mio, fighting off the pleasure, tries to question the woman controlling the giant toad. Mikoto responds in delight to find that the women assimilated by the toad were aware and lucid, commenting that her experiment was a success. The mad scientist would reveal that she was hired to research "fusion magic" to see if it was possible to merge beings with eachother and what are the long term effects it has. Mikoto explains she created the Jinmen Giant Toad so that she can easily converse with anyone it assimilates, and have it stockpile spiritual energy. Also, she reveals that the toad is generating chemicals like dopemine and aprodisiac-like substains to increases productivity of spiritual energy within its victims. Mio then plead with Mikoto to unfuse them from her monster, which Mikoto claims that she was going to do so anyways. Mikoto would disclose that her client wanted to see if it was possible to transfer an already fused person to another host. She then sadistically divulge the Jinmen Giant Toads most terrifying trait. That it would turn anyone it assimilated with high enough spiritual engery into "eggs" that the toad would lay, and then they would have a new Jinmen Giant Toad that would become their new host. All Mio and her friends can do is scream in horror as they are slowly absorbed back inside the toad's body, Some time afterwards Mikoto would meet with her client, who would turn out be Edwin Black, as he looks into a water tank. Mikoto would give Black a flash drive containing the findings of her research. The mad scientist comments that there are easier ways for someone like him to get the results he wanted without the secrecy or the need to hire a "freelance" researcher. Black disagrees as he needed to clear the sewers of patrols so that the rising crime syndicates can smuggle there goods through the system, and to get rid of warriors that can do "spiritual damage". According to Black, after the vice president's disappearances, missions to clean up the sewers have been suspended, and Mio and the other exorcist are presumed dead. As for the secrecy, Black claims that some his underlings might not agree with the "big plans" he has when it comes to fusion magic. Mikoto wishes Black luck, and says she is going to be moving to the UFS for her next job. Black questions Mikoto on what she plans to with the exorcism club members, as they are no use to him. She responds by claiming that she is not done with them yet, and has already come up with a couple experiments that she like to perfom on them. Mikoto would look into the tank containing the exorcism club members who all have been turned in "toad eggs", except Mio, whose face is already on the back of a tadpole.

Life as a Test Subject
The still assimilated Mio would make a brief appearance when the Main Universe's Murasaki Yatsu and Takuma Kiryuu visited Mikoto's labatory to try to get her help in dealing with a multiuniversal crisis. While Murasaki was talking with Mikoto, Takuma wonders around the labatory and started hearing moaning coming from one of the water tanks. When he went to get a closer look of what is inside the tank, he is startled to see the face of Mio, now of the back of another tadpole. When Takuma questions the Evil Universe version of his aunt about the "tadpole", Mikoto enthusiastically explain that she performing a long term experiment with that subject, and wants to see how many "life cycles" Mio can go through before any "adverse effects" start showing. According to Mikoto, Mio had gone through nine "life cycles" and the only "negative" effects she discovered so far have been psychological. As Mikoto goes over her theories of the benefits an assimilated being might get from constantly transfering from one vessel to another, Murasaki's interrupts Mikoto, partially because she did not want Takuma to hear the inhuman experiments Mikoto have been performing, and came to the realization that Vampire Asagi plans to make the Another Universe's Asagi into her new vessel so that she unfuse from Edwin Black and can gain a body of her own. The assimilated Mio is still left in the water tank when Murasaki and Takuma departs from the labatory. Mio presumably spent the rest of her life as a part of different incarnations of the Jinman Giant Toads until the merger of the three universes.

Trivia

 * The fate of Mio, and by extension the majority of the Exorcism Club, in th Evil Universe is considered one of the darkest in the franchise.
 * Mio is listed as one of the casualties among the heroes of the Evil Universe despite technically still being alive during the advents of the Kaiju World War films.