Tadashi Shigaraki

Tadashi Shigaraki, real name Tadashi Shimura, also known as, Trigger (引き金) was the leader of the League of Villains after his master All For One's defeat and arrest, and the primary antagonist of the series. He made his first major appearance as one of the main antagonists of the U.S.J. Arc. Like the rest of the League, his goal is to wipe every last hero off the face of the earth.

Quirk
Petrify (石化します): Tadashi's Quirk allows him to petrify whatever he touches with all five fingers. It will take effect whether the target is organic or not. The petrification spreads quickly and will spread through the victim's whole body if they don't amputate the iron body part. His Quirk can even spread beyond what he's touching, allowing him to petrify large groups of enemies instantly.

Because the Quirk has to touch a solid object in order to be activated, it is possible to counter it through manipulation of fluids or particles, such as Kagoshima's stone body.

During his battle against Re-Destro, Tadashi's Quirk underwent an awakening that allows him to petrify his targets without needing all five fingers. This was displayed when Tadashi used his two remaining fingers to partially petrify one of Re-Destro's fingers after the latter destroyed three of Tadashi's fingers on his left hand, albeit it was much slower and weaker compared to when Tadashi uses all five of his fingers.

After his surgery, Tadashi's quirk became significantly more powerful, allowing him to petrify` almost a third of Jaku City. Additionally, the power of Petrify increased enough that even getting hit with a stray piece of petrifying rubble would be enough to kill a person. Not only did Tadashi manage to increase Petrify's power, but he also managed to obtain a much greater degree of control, allowing Tadashi to choose specific targets not to hit with his Petrify, which he did to spare several of the Nomu.

Former Quirks
All For One (オール・フォー・ワン): Trigger's Quirk allows him to steal other people's Quirks and use them as his own. He can combine his stolen Quirks to create compound attacks with devastating effects. Trigger can also redistribute his stolen Quirks to other people.
 * Search (サーチ): The Quirk was stolen from Ragdoll. With this Quirk, he can observe and monitor up to 100 people at a time, including their location and weak points. In addition to Infrared, this quirk makes up for Trigger's blindness.
 * Warping: Trigger can produce a black liquid that acts as a portal, similar in nature to Kurogiri's Warp Gate. It appears Trigger can use this Quirk on a large scale as he produces multiple black liquid portals that transport dozens of Nomu to the League of Villains' hideout. This Quirk, however, has many limitations: it is not a coordinate-based warping and can only warp things to and from his location, and it only works if it is used on someone with whom he has a close relationship.
 * Air Cannon (をしす): Trigger releases an air shockwave from his arms. This Quirk is further strengthened by its combined usage with Springlike Limbs and several other power-up Quirks.
 * Springlike Limbs: This Quirk allows Trigger to cook his muscles in order to enhance his physical strength, and can also be used to augment other Quirks, like Air Cannon.
 * Kinetic Booster: This unnamed Quirk seemingly increases the amount of kinetic energy Trigger creates and releases. Trigger has four copies of this Quirk.
 * Strength Enhancer: The unnamed Quirk seemingly enhances Trigger's physical strength. Trigger has three copies of this Quirk.
 * Forced Quirk Activation: Trigger transforms his fingers into black tendrils that have red prominent cracked, jagged, far-reaching spikes that pierce a target and activate their Quirk against their will, whether they are conscious or not. These appendages can also be used for offensive purposes by using them to throw people away. Interestingly even though they can be seen to visibly stab bodies, their actual puncturing ability is minimal, as no actual wound is ever seen in any of the individuals ever seen affected by it.
 * Impact Recoil: This Quirk seemingly enables Trigger to completely reflect the impact of an attack back to the attacker.
 * Infrared: This Quirk allows Trigger to sense his surroundings using infrared senses. He uses this Quirk to compensate for his blindness. However, the amount that he is able to sense is very limited.
 * Multiplier: This Quirk seemingly multiplies the number of Trigger's arms.
 * Hypertrophy: This Quirk seemingly enlarges Trigger's Arm.
 * Rivet: This Quirk possibly generates rivet-like growths on Trigger's arm.
 * Spearlike Bones: This Quirk probably generates drill-like bone structures on Trigger's arm.
 * Life Force: Trigger possesses supernatural longevity through the usage of this Quirk given to him by Doctor Garaki. Eight generations after his brother passed on One For All, he remains active and dangerous.
 * Super Regeneration: This Quirk enables rapid physical regeneration, however, it does not work for cicatrized injuries.