Stress

Classified as a transformation-type Meta Ability with close-range application, Stress belongs to Rikiya Yotsubashi, better known as Re-Destro. It enters the manga in Chapter 218 and the anime in Episode 109. The premise is an emotional engine: negative feeling goes in, raw power comes out, raising strength, resilience, and physical size.

Severity scales with feeling. The worse the emotional load, the bigger and more durable the affected portions of his body become, and the resulting power announces itself through black markings that creep across whichever areas have been enhanced. The Quirk is functionally comparable to Body Bulk.

Enhancement is selective or total at the user's discretion. Any single limb can be boosted on its own, or the whole frame can be upgraded at once, and the disparity in output is enormous. One finger sufficed to wipe out a Double belonging to Twice, while a single swollen arm wiped out several League of Villains clones and threw off a massive shockwave with one swing.

Rikiya quantifies his own output. He dials a percentage of "Liberation" as a gauge for how far he pushes the enhancement, and at 80% he becomes a black, hulking monster whose sheer physicality left Tomura Shigaraki thoroughly outclassed.

The vulnerability is built into the concept. Because the ability needs unhealthy emotion to run properly, positive states such as peace and relief work against it, draining the stress it feeds on. A second limitation came later: once fitted with prosthetic legs, Rikiya found the artificial limbs unable to bear his amplified weight and power, capping what he could safely produce. Tsukuyomi's Ragnarök forced him back on exactly that weakness.

Re-Destro is the only holder, and his mastery has an unhappy origin. Carrying the weight of Meta Liberation's history and the obligation to build a liberated future supplied a permanent reservoir of tension, which the narrative blames for both his male pattern baldness and his habit of tipping into overwrought emotion.

His combat use is calibrated. Reinforcing his body with the black markings buys him speed and strength together while extra mass raises his overall toughness, and he meters the investment against the opponent in front of him, a fingertip for one of Twice's Doubles, his entire body for Tomura. The bulk answers Decay neatly: he pounds crumbling ground without concern, keeps pace with Tomura despite his size, and crushed three fingers on Tomura's right hand between one giant thumb and forefinger.

At the upper registers the power turns projectile. Running 80% Liberation, his monstrous form attacks with black stress energy, and a handful of that mass launched Tomura across the battlefield while tearing apart a sizable share of Deika City. His named techniques include 80% Liberation, which swells his bulk and sheathes him in darkness by spending his stockpile, Stress Output Burden, which concentrates that energy into a strike, and Stress: 100%, pushing mass and strength to their limit and letting him discharge broad waves of black energy from both hands together.