Poppy Pipopapo

Asuna Karino (仮野 明日那) is a registered nurse at Seito University Hospital and a personnel from the Ministry of Health. In reality, "Asuna" is a guise for her true identity known as Poppy Pipopapo (ポッピーピポパポ), a benevolent Bugster based on the character with the same name from DoReMiFa Beat, who acts as the "navigator" for the Kamen Riders.

Using the Toki Meki Crisis Gashat and the Buggle Driver II, she is able to transform into Kamen Rider Poppy (仮面ライダーポッピー).

Past
Poppy is a Bugster based on the mascot of Genm Corp.'s DoReMiFa Beat. During Zero Day, she was born from the Bugster infection of an unnamed host whose life was sacrificed in the process, thus making Poppy a complete Bugster. She was later assigned to be a navigator for the Kamen Riders, taking the guise of "Asuna Karino" in order to blend in more easily.

Second Bugster Outbreak
Five years later, a second outbreak of the Bugster virus occurred. While Hiiro Kagami had been selected as CR's Rider, Asuna proposed a second candidate: a prodigious and anonymous gamer known only as "M". While Kyotaro Hinata seemed hesitant, he agreed that having another candidate was wise after the incident that cost Taiga Hanaya his job. He gave her a Gamer Driver and the Mighty Action X Gashat to give M should she find him, and gave her the orders to reopen CR.

Along the way, Asuna ran into Emu Hojo, a pediatrics intern chasing after his escaping patient. Asuna quickly realized that the patient, Sota Suyama, was experiencing symptoms of the game disease, a diagnosis that was confirmed shortly after. For the boy's sake, Asuna had Emu help bring Sota to CR. After touching base briefly with Haima Kagami, she left for Mighty Action X's press release in the hopes of finding M there, only to find Emu had brought Sota to the release. When she tried to take Sota back, the Bugster took over the boy's body, wrecking havoc on the conference. Asuna was forced to explain the Bugster virus to Emu, and told him about trying to find someone to use the Driver, not expecting that Emu would take it for himself. Much to her shock, Emu was not only compatible with the system and capable of becoming a Kamen Rider, but he had been M all along. After watching him defeat the Salty Bugster, Asuna finally showed him to CR, revealing her true form as Poppy and christening Emu as Kamen Rider Ex-Aid.

Soon after, Poppy was contacted by Kuroto Dan, who requested a recording of the Action Gamer's specs as performed by Emu. As such, Poppy had Emu undergo a brief virtual reality simulation within the CR paitent room using a device designed by Kuroto Dan. She promptly left after the simulation was concluded without explaining her reasoning to Emu.

Ganbarizing
Asuna accompanies Emu on his way to Genm Corp., the intern having been instructed to return the Kaigan Ghost Gashat back to Dan, only to be intercepted by a Collabos Bugster. When Dan is attacked by the Bugster after providing Ex-Aid with additional Kamen Rider Gashats to fight it, Asuna takes him to safety only to lose him as he secretly joins the battle to collect data as Kamen Rider Genm, culminating in the completion of his Ganbarizing Gashat.

Poppy Pipopapo later finds the inert Collabos Bugster which she is unable to budge, projecting a blank Game Area which soon enough manifests as Ganbarizing, causing it to come back to life and go berserk before Ex-Aid arrives, allowing Poppy to get away. After Emu uses the Ganbarizing Gashat to destroy the Bugster, both he and Poppy are confused to find that a Game Clear message has not appeared. The Ganbarizing Gashat then suddenly ejects from the Gashacon Breaker on its own before entering the Game Area from which a figure emerged. Though Emu recognized him as Kamen Rider Hibiki, Poppy mistook him for a malicious demon and ran away.

Kamen Rider Chronicle
She is revealed to be a final component of the Kamen Rider Chronicle, thus being targeted by other Parad's forces and her mind is altered by none other than the third Genm Corp. CEO Ren Amagasaki.

Now being a part of Kamen Rider Chronicle, Poppy serves her new role as the navigator for the Ride-Players instead. She is later given the Gashacon Bugvisor II and the Toki Meki Crisis Gashat, allowing her to transform into Kamen Rider Poppy, enforcing the game's rules and punishing characters who fail to serve their purpose. It is later revealed by Parad that Poppy's memory was actually reset, and that her supposedly "benevolent nature" was part of her original programming, as her true purpose was to collect data from CR for the Bugsters.

However, it appears that Poppy retained some of her memories which are suppose to be cleared as Poppy was relieved that Emu was saved by Snipe upon Lovrica's defeat.

Personality
Poppy Pipopapo was created to serve as a guide to the riders in CR. She provides insight on the Bugster viruses, the Rider system, and helps to transfer patients to CR if the situation requires it.

Poppy's true personality is bubbly and energetic. As Asuna, however, she takes on a mature and no-nonsense persona, although her normal personality will momentarily surface if she is addressed by her real name. But there have been times when Poppy as Asuna reverts to her true personality on her own free will. Despite being based on a Vocaloid, ironically, it is revealed Poppy cannot sing very well without music to accompany her and causes distress to those around her when she does.

After being brainwashed by the Bugsters, Poppy still has her bubbly personality, but she seems completely apathetic to the suffering of humans and casually focuses on her job as the "navigator" of Kamen Rider Chronicle. However, if Kamen Riders help the Ride-Players in the "game", which she states is against the rules, she will take on a serious persona briefly with a deeper voice and attack them as Kamen Rider Poppy. When Emu tried to get through to her to snap out of it, her erased memory and programmed loyalty to her kind caused her to knock him aside without a second thought. Fortunately, Emu restored her to normal using his reprogramming powers as Ex-Aid Maximum Gamer Level 99.

However, she has gained the memories of the female patient she killed in order to be brought into existence as a side effect. This briefly traumatized her to the point of almost breaking her emotionally, but Emu tried to reason with her that it was not her fault she was born into the world that way and she is not a killer as she has helped him save countless lives as his nurse. This seems to have made her feel a little better, but it is unknown how much of an impact it has on her emotional guilt.

Arsenal

 * Two Energy Blades: As Poppy Pipopapo, she can turn a knife and a fork into energy blades that she can either attack an enemy with or break a Chocolate Block from the Mighty Action X Gashat to receive an Energy Item.
 * Teleportation: Like the Bugster executives, Poppy is capable of entering any level selected by the Kamen Riders.
 * Dance Influence: Poppy can influence Bugster Viruses into a rhythm dance.

Devices

 * Bugster Buckle
 * Buggle Driver II - Transformation device. Combined from Bugster Buckle and Gashacon Bugvisor II.
 * Rider Gashat - Transformation trinkets.

Weapons

 * Gashacon Bugvisor II - Transformation device and primary weapon.

Portrayal

 * Asuna Karino is portrayed by Ruka Matsuda (松田 るか), who previously portrayed Katsumi Sasahara in Kamen Rider Ghost: Ikkyu Eyecon! Awaken, My Quick Wit Power!!. As Kamen Rider Poppy, her suit actor is Jiro Uchikawa (内川仁郎).

Etymology

 * In episode 12, Hiiro Kagami pointed out that her alias, Asuna Karino is simply a wordplay of "temporary nurse" (仮のナース). As Poppy Pipopapo, she is most likely named after the Hatsune Miku song, PoPiPo.