Depending on Kei Azuma's gender, their roles will be swapped. If the protagonist is male, Baraki will be the friend he grew up with and Sumire will be a young girl and Emi's classmate. Whichever one is the protagonist's friend will also become a Debugger. They're the "Chaos Heroes" of the game and will be the protagonist's partner if the protagonist chooses to align with Chaos.
They are both fought separately in all the law and neutral routes