Official character description would have Thunder down as a girl void of facial emotions, she always speak with a neutral and calm voice. She often expresses her emotions with the powerful gun shots, because of this peculiar hobby she have quite the demand for destructive weapons.
Thunder's first story appearance was a minor character in the event Singularity. Thunder is one of the five T-dolls who represented Girls Frontline during the DJMax: Respect collaboration event: Glory Day, as a main character, she had major interaction with the event.
The hidden level of Singularity chapter 1 began with AR CZ2000CZ2000 briefing the Commander about a Ferri command post, she located the command post while she was on the field. CZ2000's plan involves the Commander deploying forces to help her get near the post, which she will in turn blow it sky high. Thunder radioed in and interrupts the two, she presented the complete structure map of the command post and enemy forces distribution Intel. Thunder proposed that it is ill-advised to confront the enemy directly, she also suggested a new route with less patrolling units.
CZ2000 wasn't exactly pleased with the interruption, she is even less pleased that Thunder addressed her as "Crabby", a nickname SMG SkorpionSkorpion made for her. But CZ2000 states that she will carry out the commands if the Commander chooses to go in gun blazing or sneak around on the new route put forward by Thunder.