“Hi Copen. :) I'm all right.”
—Mytyl , Azure Striker Gunvolt 2
Mytyl is Copen’s twin (younger) sister, who like her twin brother, does not possess any septimal powers. Due to her weak constitution, she spends her days living in a long-term medical care facility. She has been extremely frail since birth, and due to a surgery she had at a very young age, she lost her voice and now communicates with people via a tablet.
Likely do to her frail constitution and being long-term medical care, she is quite small in stature, which gives many people the impression that she and Copen were born many years apart, but they are in fact the same age. Copen does not speak to her at all about his battles.
Mytyl is a young teenage girl with gold eyes and long white hair. Due to her small and frail stature, she comes across as much younger than she really is.
She wears a pink dress with white frills and a blue bow on her chest. She has a red ribbon tied into her hair.
Mytyl acts as the primary partner for most conversations and increasing your bond with her somehow increases the chance Lola can activate Anthem.
Mytyl was born with the Muse's septima, but her body was not strong enough to contain it, causing the power to overwhelm her and waste away her health.
Dr. Kamizono performed an operation to extract her septimosome, saving her life but taking away her voice. Both Copen and Mytyl were too young to remember the exact details of this, and Dr. Kamizono died during a classified experiment.
She would then spend the rest of her life in a sanatorium built by the Kamizono family, under watchful care by servants and doctors.
Mytyl was also Lola's conversational partner during the latter's AI development period. This led to Lola referring to Copen as "Boss", apparently.
Some time before the events of Azure Striker Gunvolt 2, Mytyl is kidnapped by Eden and tucked away on the Sumeragi airship Seraph.
She is nearly abducted by a strange robot before being saved by Gunvolt. Later on, Copen would arrive and whisk her back to their home. Mytyl has no memory of this, as she was unconscious the whole time.
After Gunvolt defeats four of The Seven, Eden once again kidnaps Mytyl. Asroc runs off with her to Eden's headquarters "Garden". Copen runs in pursuit, leaving GV to fight Ghauri. Again, Mytyl was unconscious the whole time and retains no memory of this.
After GV makes it to the center of the Garden, Zonda uses Mytyl to steal the shards and completely erase Joule. Upon Zonda's defeat, Mytyl dies, and Copen attacks GV in grief and rage. When Copen falls, Mytyl suddenly rises into the air, materializing Lola and Joule next to her. She begins to sing the Anthem, and revives Copen. Her song continues to be sung up until Copen is defeated again.
When Copen loses a second time, GV attempts to walk closer, when Mytyl suddenly gets in his way, telling him not to get close to her precious person. When she is called by the names "Mytyl" and "Joule", she becomes confused, as she doesn't recognize those names or the two people nearby her. Copen then takes Mytyl to a hospital as GV leaves.
A few weeks later, Mytyl, now able to speak and walk, is wandering the city with Nori in tow, when suddenly, she sees somebody who seems familiar and another standing next to him. She asks him, "are...are you an angel?" He seems confused at first, then she explains her amnesia and asks if she's met the two somewhere. The boy asks for her name, but afterwards tells her she is mistaken, that they've never met before. The two then part ways, unlikely to ever meet again.
After Copen defeats four of The Seven, Eden breaks into the Kamizono estate (again) and kidnaps Mytyl (again). She is then taken by Teseo and whisked away to the Garden. Again, Mytyl was unconscious the whole time and has no memory of this.
Once Copen makes it inside the Garden, Zonda gives an expository on Mytyl's secret past, hidden in some of Sumeragi's files. Denying this, Copen charges into the heart of the Garden, only for Zonda to use Mytyl's body to steal Lola's shards. After Copen ends Zonda's ambitions, he finds Mytyl dead on the ground. He takes out his grief and rage on the nearest available target, which just so happens to be Gunvolt.
When Gunvolt seemingly dies, Mytyl suddenly rises into the air, hijacking Lola and forcing her to materialize alongside Joule. She begins to sing her Anthem, which brings back Gunvolt, stronger than ever. Her song resounds onward until GV finally falls again.
As Copen tries to finish Gunvolt off, GV is protected by a barrier. Then, Mytyl gets in Copen's way, asking him not to kill her precious person. When called by "Joule" and "Mytyl", she becomes confused, not recognizing those names nor the two people before her. Copen rushes her off to a hospital, allowing GV to leave for now.
Mytyl is physically healthier than she ever was before, able to walk and speak now. However, she remembers nothing about her past or her family. Copen renounces his name as a "Kamizono" in order to avoid dragging her into his battles again, and he leaves without her ever knowing.
Mytyl appears as a collectible pixel sticker that is obtained by completing the "Credit Where Credit's Due" challenge.
"Welcome, Acura - kun. Today I feel fine."
—Mytyl, Japanese Official Site
She’s a character whom I tried to draw as a negligee and got the OK almost at the first try. Her main image is that of weakness, and fleetingness, as if she’d disappear at any time. The bell hair ornament was added because Tai-san, in charge of the scenario, asked me to do so. I normally can’t draw characters differently but Mytyl’s face is totally identical to Cyan’s face in the prequel. If you wonder why I did that, I think you’ll realize if you play the game until the end so… Go ahead and check it out.