Nasu is a skilled Shooter who has reached Master Class despite still being in B-Rank.[1] According to Tachikawa, she and Izumi are the only agents capable of programming the trajectories of Viper in real time.[2] During her Rank Battle with Mikumo Unit and Kuruma Unit, she manages to defeat all her assailants despite the fact that she was on her own and targeted by all three, while also watching out for Chika's sniping. According to Tachikawa, her usual way to fight consists in using obstacles as shields and cornering the opponent with her mobility. She has been shown to run on the side of buildings and jump from one to another.


Rei Nasu's Triggers
Type: White trion Normal Shield
Nasu Shield

Border's default Defense Trigger that enables the user to create a barrier that can block opponent's attacks. Nasu often generates large Shields to protect her whole body.

Type: White trion Normal Viper

Rei Nasu Viper

Birdcage anime

Nasu is one of the only two Border agents who can create new trajectories for Viper every time they use it, the other being the Shooter of the top A-Rank unit Kōhei Izumi.[2] Thanks to this skill, her attack patterns are countless regardless of her position in relation to the target, especially since she can bypass obstacles.[3] She generally uses Viper in Full Attack. The unpredictability of her bullets makes the difficult to stop or evade, especially thanks to her ability to anticipate the movements of the opponent. Her tactics are extremely varied and involve feints, sudden changes of target, focused or scattered fire, and aiming at multiple enemies at the same time. She first used Viper in chapter 96 (episode 44 in the anime).

Birdcage (鳥籠(とりかご) Torikago?): By using Viper both through the main and the sub, Nasu unleashes a multidirectional attack to simultaneously target all enemies within her sight or visible on Radar, proving to be a threat even when surrounded.[4] Feinting this technique and then concentrating fire enables them to thwart possible countertactics.[5]

Type: White trion Normal Meteora
Nasu Activating Tomahawk

Nasu primarily uses Viper to fight, but she occasionally resorts to Meteora, too. She has recently taken to merging it with Viper to form Tomahawk.[6] She first uses it in chapter 102 (episode 45 in the anime).

Type: White trion Normal Tomahawk
Nasu Tomahawk

Nasu can fuse Viper and Meteora cubes in a short amount of time to create Tomahawk. She used it with tremendous skill since the first attempt in Rank Battles,[6] thanks to her ability to freely set Viper's trajectories and to guess how the target will move,[7] despite this composite bullet being extremely difficult to control.[8] As her most used offensive Trigger is Viper, the target may not notice she is using Tomahawk at first, increasing the chances her attack will be successful.[9] The wide explosion radius and modifiable patterns of this composite bullet enable her to shoot it without a direct line of sight, and thus without exposing herself to enemy fire.[10] She first used it in chapter 102 (episode 46 in the anime).


Trion Attack Defense/Support Mobility Skill Range Command Special Tactics Total
Border Briefing File[11] 7 8 6 8 8 4 5 4 50