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Devola, also known as Debol in the Japanese release, is a major character in NieR and NieR: Automata. She is the twin sister of Popola and a friend of Nier.
Devola is a bard and is a regular performer at the tavern in Nier's village. Popola, her twin sister, is the librarian in charge of the village library. Both sisters are considered the leaders of the village and are always looking out for Nier's daughter (sister in RepliCant) Yonah during his frequent absences. Devola is the one who gives him side missions.
Heads up! Important plot details for NieR, NieR:Automata, NieR Reincarnation, or other related media may follow. Read at your own risk!
When the player reaches the Shadowlord's Castle, it is revealed that both Devola and Popola are androids working for Project Gestalt. The twins are revealed to have lived for thousands of years as a result of the initial experiments of the project, and have thus been charged with keeping eye on other experiments as a result: namely over the members of the entire party, including Yonah. They were made to provide support when the day has come for Gestalts to return to the Replicant's vessels. They are tasked with extracting data from Gestalts' souls, making new Replicants' bodies, and returning a dead Replicant's data to its Gestalt.
It is also revealed that the Sealed Verses originated from the experimentation on them both, stating that they only loaned Grimoire Weiss a fraction of their power, thus meaning that their magic and capabilities are far superior to that of Grimoire Weiss.
Death
Devola dies in her sister's arms after being defeated by Nier.
"You know, I understand now why we're twins. It's because....because we were born without souls. This world is too lonely for one without a soul. There's too much...emptiness. Our souls are missing, but our tears still work. That's kinda weird. Sorry, Sis. ...I love you."
Popola and Devola aid 9S in getting inside the Tower by serving as distractions to the machine enemies. After 9S fails at hacking his way inside, Popola makes an attempt at the cost of being perpetually electrocuted. Devola defends the 9S and Popola from the machines until Popola manages to open the Tower's gate. Devola annihilates the robot she's fighting and drags 9S through the gate Popola opened, saying her goodbyes to 9S as the gate begins sealing itself again. As soon as the gate fully closes it, Popola receives a presumably fatal shock, which brings about a static screen.
A heavily wounded Popola is later seen by with Devola by A2 at the Tower's entrance. They ask A2 if they managed to do some good, with A2 mentioning they had. The pair reveal to her that they have opened the Tower for 9S.
Countdown artwork featuring Devola, Popola and Emil by Itahana Toshiyuki.
Devola and Popola at the Resistance Camp.
Devola and Popola at the Resistance Camp.
Devola and Popola ready their weapons.
Devola.
Devola and Popola help 9S get into the tower.
Devola and Popola help 9S get into the tower.
Devola catches a heavily injured Popola.
Trivia
Their names come from the weapon "Skald's Song" (which was named deborupoporu (デボルポポル) in the Japanese version�) in Drakengard and the "Blade of Treachery". Additionally, according to a Drakengard guidebook, Taro Yoko liked the weapon story and wished to someday make them characters in one of his projects. The names were taken from two dogs owned by an acquaintance.
According to Nier, when Devola drinks alcohol she becomes "very friendly". This is further demonstrated in the Drama CD.
She is good at tying a cherry stem with her tongue.
