Trigger (トリガー Toriga?) or T, also referred as Weak Quirk Improvement Drug, is a type of drug that gives a boost to a individual's Quirk, simultaneously weakening their sense of reason. Trigger addicts suffer a side-effect after the use that changes their tongues color to black.
- A villain amplifies his Blades, sprouting a great number of very long blades from his body. He is capable of controlling them, sprouting and retracting them, as well as focusing them into one place to reach great destructive power. They become sharp enough to nick Eijiro's Hardening.
- Joi Irinaka of the Shie Hassaikai amplifies his Mimicry, allowing him to affect much larger than the physical area of a refrigerator, his normal limit, and to merge with and manipulate an entire underground facility in preparation for the Heroes' invasion.
- Rikiya Katsukame of the Shie Hassaikai amplifies his Stamina Absorbing, allowing him to use it without making physical contact with others, absorbing stamina by simply inhaling.
- Raputo Tokage amplifies his lizard appearance to a strong Pterodon Physiology Quirk.
- Moyuru Touchi, who only appeared to have a small flame in place of his hair, is amplified to become a powerful flaming rock golem.
- Soga Kugizaki amplifies his Spike to a Porcupine Physiology Quirk, that sprouts stronger spikes all over his body.
- Mario Kugutsu is transformed into a massive four-armed giant.
- Akira Iwakou, whose Quirk was amplified to a Hardening transformation-type Quirk, with additional Enlargement and Super Strength abilities.
- Teruo Unagisawa, whose Quirk made him somewhat resemble an eel, was amplified to an Electric Eel Physiology Quirk with a large eel's body and small human limbs. He also had greatly enhanced mobility, being able to bounce off the walls of buildings to launch himself into the air and even keep up with Pop Step's Leap. Unagisawa was later abducted by Kuin Hachisuka and seemingly injected with several doses of Trigger over an extended period of time, which lastingly modifies his body into a large electric eel with slippery skin, but this time with very mucular human limbs. He is able to discharge electricity, but doing so renders him unconscious. It is unknown whether this modification is permanent.
- Kuin Hachisuka, while not initially a user herself, utilizes her Quirk as a specialized delivery system to infect dozens of Quirk-using citizens in order to effectively test drive trigger's potency while in use. Later she uses it to transform her body, strengthening her and allowing her to use an electric quirk.
- An civilian from Chapter 5 (Illegals), who was amplified to gain blades on his fingers and shoulders, as well as Muscle Enhancement and Enlargement.
- An civilian from Chapter 5 (Illegals), who was amplified to release electricity from her eyes.
- An civilian from Chapter 5 (Illegals), who was amplified to release black fluid from his palms.
- An civilian from Chapter 5 (Illegals), who was amplified to catch on fire.
- An civilian from Chapter 5 (Illegals), who was amplified to become very large and round, with dark skin and lighter markings. His body also released streams of water from several points.
- ↑ Vigilante - My Hero Academia: Illegals Manga: Chapter 2 (pp. 3-4).
- ↑ My Hero Academia Manga: Chapter 133.
- ↑ My Hero Academia Manga: Chapter 139.
- ↑ 4.0 4.1 Vigilante - My Hero Academia: Illegals Manga: Chapter 2 (p. 3).
- ↑ Vigilante - My Hero Academia: Illegals Manga: Chapter 2 (p. 18).
- ↑ Vigilante - My Hero Academia: Illegals Manga: Chapter 2 (pp. 26-27).