In Zombie File, the players will take role of her to discover the secrets behind Zombie Scenario.
A senior researcher who founds Aegis Institute to fight the zombies. She has excellent weapon capability and has a history of participating in the Dr. Rex Super Soldier Program for her PhD Research Project.
Soi is a senior researcher in Aegis Institute about the zombie virus outbreak.
She is the second NPC to become a playable character after Henry Stoner.
Also, she's the first character to be playable before her model was officially released. Before her character was sold in the shop, she was only playable in Zombie File as the default character to discover the secrets.
Some voices used for her in Zombie File are taken from a Japanese girl in Counter-Strike: Condition Zero Deleted Scenes. However, there are some new sounds added, probably are voiced by a Korean.
According to the game files, Researcher Soi uses doctora entity which refers to Dr. A or Dr. Aegis.
In Taiwan/Hong Kong version, she is named as Mariko (麻里子).
Unlike other NPCs, that only has 1 message picture shown in Zombie Scenario, she has many message pictures, each depends on her emotion.