Ina appears as a little girl with green hair, dressed in white gothic lolita style clothing. According to Piros the 3rd, her character costume doesn't officially exist and she is a cheat character.
Ina is Ovan's younger sister. Her real name is Aina Indou (犬童愛奈). She was hospitalized with a serious illness and sent to Germany for care sometime before Roots. She started playing The World to be with her brother.
Ina played The World with her brother, and they spent most of their time in secret areas, such as The Creator's Room, reading the books contained within, her favorite being the Epitaph of the Twilight.
One day, an AIDA appeared there and attempted to attack her, but Ovan blocked the attack, himself becoming the first AIDA-PC. Immediately, he lost control, and as Tri-Edge he turned Ina into the first Lost One. To make things worse, Ina's sleeping PC was eventually infected by AIDA despite his efforts, and couldn't be removed by Data Drain, due to the depth of her illness. Ovan knew that this gave him limited time to save her before her consciousness, now solely existing in The World, would be destroyed by the AIDA.
Desperate to find a cure, Ovan formed the Twilight Brigade to search for Aura, and recruited Haseo. Ina, connected to the AIDA in his arm, was always somewhat aware, watching Ovan as if in a dream. Ovan's plan ultimately failed, culminating in him turning his friend Shino into a Lost One as well, and he resorted to his final plan, to use the power of Corbenik's "Rebirth" ability to eliminate the AIDA from the entire Internet. During this time, the AIDA-infected Ina began to wander, and rumors fly of the "White Gothic Lolita Ghost Girl", causing even Piros the 3rd to spring into action to confront the illegal character. She also associated with Bo, fascinated by his twin personalities.
Once Haseo had become strong enough, Ovan confronted and fought him, and Corbenik was destroyed. This triggered a failsafe that Harald had built into The World, allowing Ovan to unleash a reset command on the entire world's network, exterminating the AIDA. This revived Ina, but left her brother, who took the full impact of the reset, in a coma.
Ina initially blamed Haseo for what happened to her brother, preferring things to be how they were when she was infected, with her and her brother always together. She embraced the Gomorrahs and the destruction they would bring to the game that took her brother's mind and made him a criminal, but Haseo eventually convinced her to trust in the sacrifice Ovan made for her sake, and she joined the fight against Cubia.
Ina, Haseo, and Yata went to Hulle Granz Cathedral, the only area protected from Cubia by an unseen force, to try to contact Aura, and Ina revealed that she still possessed the original Epitaph of the Twilight. When she produced the book, however, it reacted with the Cathedral, and affected her character, causing her to read the introduction. As she did, Haseo's Epitaph responded, and he used the power of the seven other Epitaphs that Skeith consumed to complete the process. The Three Azure Knights intervened and attacked the group, but Ina, possessed by Aura, commanded them to stop. After a brief dialogue with Yata and Haseo, Aura returned to The World's sea of data, and Ina returned to normal.