Asteroid

"No special attributes, but powerful bullets: Asteroid."

- Shiori Usami on Asteroid.

Asteroid is a Gunner Trigger.

Appearance
Asteroid is a projectile which appears as a straight, luminous trail once shot. The size of each bullet is directly proportional to the amount of trion the user has. Gunners fire Asteroid bullets through different types of gun-shaped Triggers, whereas Shooters form a trion cube that can be divided in smaller regular polyhedrons, their size and shape depending on how many are created at once.

Overview
The origins of this Trigger are unknown. It was first used by Shooters only, until firearm Triggers were invented.

Abilities
Asteroid ammunition is more powerful than that of other Gunner Triggers, boasting also higher speed and range, but it lacks any special properties. Nonetheless, Shooters can vary their attacks by scattering and delaying their bullets. Asteroid is particularly effective for concentrated fire. Like other Gunner Triggers, its power, speed and range are heavily affected by the trion levels of the user. Osamu's whole Asteroid cube was so weak a Rabbit did not bother dodging it, but when formed with Chika's immense trion amount, even a divided cube was capable of pulverizing a Rabbit. Ninomiya's Asteroid bullets have destructive range comparable to that of Meteor when scattered. With normal trion levels, prolonged, concentrated fire can eventually destroy the durable armor of those Trion Warriors.

Since the number of bullets shot plays an important part in the effectiveness of this Trigger, Asteroid ends up being very trion consuming. Despite being weaker than Attacker and Sniper Triggers, it has the advantage of range over the former and of rate of fire over the latter. In general, several bullets are needed to break a Shield.

Two Asteroids combined together form the composite bullet known as Gimlet, which enhances their penetrative power. The merging of Asteroid and Viper takes the name of Cobra. Its characteristics are still unknown.

Users
See also: Asteroid Users

Asteroid is by far the most popular Gunner Trigger, with 43 known users among official agents, of which 12 use it as a Shooter Trigger and 31 as a Gunner one. Among the latter, 20 utilize it in conjunction with an assault rifle, 10 with a handgun, 2 with a shotgun and 1 with a minigun. This list excludes those members of branches who do not participate in rank battles. The Asteroid user with the most Solo Usage Points is Masataka Ninomiya, the no. 1 Shooter and no. 2 solo combatant.

Trivia

 * All B-rank and above All-Rounders have Asteroid in their Trigger set.
 * This Trigger's abilities were replicated by Yūma's Trigger from Shūji Miwa's Asteroid to create the Bolt seal.
 * In Chapter 143 Osamu plants Asteroid bullets in specific locations, switches to Spider without their disappearing, and fires them after switching back to Asteroid. Unless this is an oversight, it would mean that Shooters can spread their bullets, switch Triggers, and then fire the planted bullets by returning to the Trigger with which they set them.