Ballistics for which you can choose the trajectory: Viper.

Shiori Usami about Viper.[1]


Izumi Viper anime.gif


Kanji 変化弾
Organization BrDr.png Border
Type White trion.png Normal
Classification Viper icon.png Gunner
- Preset trajectories
First Appearance
Manga Chapter 29
Anime Episode 15

Viper (変化弾(バイパー) Baipā?, lit. Changing Bullet) is a Gunner Trigger.

Appearance[edit | edit source]

Viper leaves a luminous trail in its wake, and it can be recognized by the sharp angles it describes as its trajectory changes. While traveling in a straight line, it is indistinguishable from other Gunner Triggers.

Overview[edit | edit source]

The origins of this Trigger are unknown. It was initially used exclusively in trion cube form, until firearms were invented.[2] At some point, Kako had her model customized.[3]

Abilities[edit | edit source]

Viper is one of the mid-ranged options available to Border agents, which can be fired as a trion cube or through a firearm.[4] It is slightly less powerful than Asteroid,[5] as part of the trion allocated to the bullet is spent on its signature ability[6] to travel along a predetermined trajectory,[1] which grants it even more complex flight paths than Hound.[6][7] Although the number of patterns available is theoretically infinite, due to Viper being the most difficult Gunner Trigger to master,[8] the vast majority of users learn only a few useful patterns. One of the most common consists in having the bullets move in a straight line before fanning out in multiple directions.[9] This can be done to target multiple opponents quickly and unpredictably,[10] shoot around corners,[11] and feint going after one target and catching a nearby one unawares.[12] Another widespread application of Viper sees the bullets spreading out and then converging on the target from multiple angles,[9] allowing the user to circumvent the enemy's shield instead of breaking through it.[13][14]

An extremely advanced application of Viper.

A handful of Border agents are capable of creating new flight paths in real-time,[9] a skill which requires advanced visualization and keen spatial awareness.[15] This ability makes their shots extremely difficult to anticipate and counter,[16] on top of rendering most stationary obstacles useless as shelter against their fire;[17] they may even exploit an obstructed line of fire by curving the flight path of the projectiles out of sight so that the opponent will misestimate their point of origin.[18] Viper users capable of coming up with the trajectories on the spot can target multiple opponents with one same bullet, so that if a bullet fails to hit its first target it may connect with the second. This can be due to the first target dodging and the bullets curving unexpectedly,[12] or to the volley following a plethora of different trajectories so that at least some will miss the first target and thus be able to continue along their path. These bullets may be set to return towards the user after luring other opponents into believing that firing the volley left them vulnerable to attack.[19][20]

As a Gunner Trigger, Viper is less powerful than Attacker Triggers in normal circumstances[21] and consumes more trion than the latter.[6] The higher the trion amount of the user, the more of it can be allocated to its three basic parameters, enhancing its performance.[citation needed] A safety mechanism is in place so that, should a bullet collide with a flesh and blood body, the owner will be knocked out from the pain and impact, without suffering any penetrating trauma.[22]

Composite Bullets[edit | edit source]

Components Name Description
Viper + Meteor Tomahawk (変化炸裂弾(トマホーク) Tomahōku?, lit. Changing Explosive Bullet)[23] Tomahawk combines Viper's programmable flight paths with Meteor's explosive properties.[24]
Viper + Asteroid Cobra (コブラ Kobura?)[25] The properties of this composite bullet are currently unknown.
Viper + Hound Unknown The properties of this composite bullet are currently unknown.
Viper + Viper Unknown The properties of this composite bullet are currently unknown.

Techniques[edit | edit source]

Name Description
Birdcage anime.png Birdcage (鳥籠(とりかご) Torikago?)[23] The user fires Viper through both the Main and the Sub and has the bullets converge on the target from multiple directions,[23][26] making them very difficult to block. The only known user of this tactic is Rei Nasu.[23]

Users[edit | edit source]

See also: Viper Users

With a mere eight known users, Viper is the most unpopular Gunner Trigger. Among its users, three fire it in trion cube form, three through an assault rifle, and two through at least one handgun.[27] Rei Nasu, Kōhei Izumi[9] and Hyuse[28] are the only agents capable of coming up with new trajectories on the spot. Viper is also used by an unknown number of trainees, and possibly by agents who do not take part in rank battles.

Trivia[edit | edit source]

  • Like other Gunner Triggers, Viper may have been named after a missile, the AGM-80 Viper, whose system offered fire-and-forget performance. Alternatively, it may be derived from a rocket, the FGR-17 Viper.
    • The viper is a family of venomous snakes. Snakes have many vertebrae which allow for increased flexibility, which is similar to how this Trigger is flexible in changing trajectory.
  • The three users capable of creating new flight paths on the spot fire Viper in trion cube form[29][30][31] and are the only ones to do so.[27]

References[edit | edit source]

  1. 1.0 1.1 1.2 World Trigger Manga Chapter 29 (p. 4)
  2. Daisuke Ashihara: Q156: Are Shooters derived from Gunners? Who created the Shooter position and how did it happen? A: The order is that Shooter came first. There are those suited for handling cube bullets and those who aren’t, so gun triggers were developed so that anyone can use bullets with a high degree of accuracy, and Gunners were derived.
    Source: Border Briefing File, Question 84, p. 305
  3. World Trigger MangaBorder Briefing File (p. 72)
  4. World Trigger MangaBorder Briefing File (p. 214)
  5. World Trigger Manga Chapter 178 (p. 12)
  6. 6.0 6.1 6.2 Gunner Triggers, Volume 4, p. 108
  7. World Trigger MangaBorder Briefing File (p. 215)
  8. World Trigger Manga Chapter 162 (p. 15)
  9. 9.0 9.1 9.2 9.3 World Trigger Manga Chapter 97 (p. 13)
  10. World Trigger Manga Chapter 79 (p. 13)
  11. World Trigger Manga Chapter 125 (p. 16)
  12. 12.0 12.1 World Trigger Manga Chapter 126 (p. 11)
  13. World Trigger Manga Chapter 58 (p. 4)
  14. World Trigger Manga Chapter 182 (p. 6)
  15. Daisuke Ashihara: Q148: What kind of skills are needed to set Viper’s trajectory in real-time? A: The imagination to visualize something that isn’t actually there as if it is, an objective viewpoint that grasps the state of the surroundings including yourself, the spatial awareness to correctly perceive the distance to the target and any obstacles, and so on.
    Source: Border Briefing File, Question 148, p. 304
  16. World Trigger Manga Chapter 97 (p. 9-10)
  17. World Trigger Manga Chapter 101 (p. 6)
  18. World Trigger Manga Chapter 59 (p. 13)
  19. World Trigger Manga Chapter 102 (p. 16-17)
  20. World Trigger Manga Chapter 189 (p. 10)
  21. World Trigger Manga Chapter 107 (p. 14)
  22. World Trigger Manga Chapter 119 (p. 5)
  23. 23.0 23.1 23.2 23.3 World Trigger Manga Chapter 100 (p. 6)
  24. World Trigger Manga Chapter 101 (p. 7-9)
  25. Daisuke Ashihara: Q143: Please tell us if there are any other composite bullets besides Tomahawk and Gimlet. A: There are ones like Meteor + Hound’s "Salamander", Asteroid + Viper’s "Cobra", Hound + Hound’s "Hornet" etc.
    Source: Border Briefing File, Question 143, p. 304
  26. World Trigger Manga Chapter 100 (p. 8-9)
  27. 27.0 27.1 World Trigger MangaBorder Briefing File
  28. World Trigger Manga Chapter 188 (p. 14)
  29. World Trigger MangaBorder Briefing File (p. 41)
  30. World Trigger MangaBorder Briefing File (p. 175)
  31. World Trigger Manga Chapter 161 (p. 16)

Navigation[edit | edit source]

e - d - vBorder Triggers
Basic Equipment Bail OutRadarTrion Body
Attacker Kogetsu (Kogetsu: Spear) • Raygust (Shield Mode) • ScorpionSōgetsu (Axe)
Gunner Asteroid • Cobra • Gimlet • Hornet • HoundMeteorSalamanderTomahawkViper
Firearms Assault Rifle • Grenade Launcher • Handgun • Minigun • Shotgun
Sniper EagletIbisLightning
Defense EscudoShield (Affixed Mode/Full Guard)
Trap Switchbox
Optional Bagworm • Bagworm Tag • ChameleonConnector • Dummy Beacon • Enhanced Radar • Full ArmsGeistGen'yōGrasshopperIdatenLead Bullet • Makō • Senkū • Silencer • SpiderStarmakerTeleporterThruster • Timer
Prototypes Connector • Dummy Beacon • Full ArmsGeistIdaten • Makō • Teleporter • Timer
Black Fūjin • Tsukihiko Amō's Black Trigger • Yūma Kuga's Black Trigger
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