Trapper

A Trapper is a Border agent who specializes in the use of Trap Triggers.

Specifics
The Trapper position is one of the 9 official positions available to Border agents, one of the 7 directly involved in combat, and one of the 3 a C-Rank trainee cannot work towards. This is because the Trigger that classifies the user as a Trapper, Switchbox, does not appear to be available to anyone below B-Rank. The exact requirements to become a Trapper are unknown, as is whether there is a ranking for this position.

Overview
The primary duty of a Trapper seem to be assisting teammates in moving around the field, fitting the role of this class a supporting one. However, they also possess marks capable of inflicting damage and to impede opponents. Overall, Trappers seem to fight stealthily, laying their traps while remaining hidden.

List of Trappers
There are 3 known Trappers in Border.

The following Trappers are listed by their unit's ranking at the start of the current season of Rank Battles.

Trivia

 * A sapper, also called pioneer or combat engineer, is a combatant or soldier who performs a variety of military engineering duties such as breaching, demolitions, bridge-building... A sapper's duties are devoted to tasks involving facilitating movement, defence and survival of allied forces and impeding those of enemies, which perfectly match the uses of Switchbox seen thus far.
 * All known Trappers have the exact same Trigger set. It is unknown if this is a requirement of the position.
 * Shinji Fuyushima cannot participate in Rank Battles. It is unknown if this is due to him being a Trapper, meaning the whole position would be prevented from taking part in them, or if there is another reason.