Spring

Introduced through the Team-Up Missions spinoff, Spring is credited to a toy company employee occupying a middling rung of the corporate ladder, a background fitting for a power built around playful physics. The Quirk debuts in Chapter 44 of that series and receives no extended showcase.

Documentation on it is thin. The infobox carries no confirmed classification or operating range, and the narrative never pauses to test the ability's ceiling, so what fans have amounts to a premise rather than a demonstrated skill set.

The stated effect is that objects can be rendered bouncy at the wielder's discretion. Nothing in the source narrows which materials qualify, how long the property lasts, or whether the elasticity can be dialed up and down, so the working assumption stays at the level of the basic description.

That vagueness leaves obvious questions open. Whether living targets are eligible, whether contact is required, and how much force a treated object can rebound all sit outside what has been established.

The original holder is the toy company employee, who is never developed beyond that role. Neito Monoma adds a second, unusual entry to the list: operating as Phantom Thief, he copies Spring, yet no scene shows him putting the borrowed power to any practical use.

Commentary has noted a family resemblance between Spring and Elasticity, since both traffic in rebound and give. The two are treated as separate Quirks rather than variations of one another.