Double

Double is a Quirk possessed by Jin Bubaigawara.

Description
Double allows Jin to create a copy of anything through touch. His clones possess the same personality and abilities as the original, making it hard to distinguish them from the real person at a first glance. In order to conceive a perfect clone, he requires a flawless image of whatever he plans to duplicate, including knowledge of precise measurements and features. The copies are less durable than the original thing, dissolving into a viscous liquid after suffere enough damage, with a second copy being apparently even more fragile. Worth mentioning is that Jin is capable of detecting when clones get destroyed if he isn't close to them.

Jin has a limit of creating only two clones at a time, though he is able to copy himself and his copies have access to Double. He is theoretically capable of produce infinite replicas of himself, as long as each clone gets to clone themselves and so on.

Usage
With Double, Jin can produce of anyone to provide support in numbers. He temporarily increases the numbers of the other members from League of Villains if they find themselves short-handed, giving the organization more "subordinates" to attack or distract enemies. As such, Tomura Shigaraki considers Jin a vital part of his villainous goals. Double had a major role in shaping Jin's character, even making him insane. In the past, he would abuse Double to form copies of himself to act as his servants and follow his bidding. Due to Jin's clones sharing the same personality as the original Jin (who was lazy and overbearing) though, they disliked the slave work they were put in and ended up rebelling against their creator, wrapping him with ropes. As each clone felt they were the real Jin and the other fakes, they started fighting amongst themselves while the original Jin could only watch in horror as his own image kept attacking and killing itself repeatedly.

Having suffered a traumatic experience with this particular event involving his Quirk, Jin currently refuses to use his ability on himself. If he is left through long periods of time without covering his face with a mask, he "will end up splitting himself". It is unknown if he is referring to an actual physical consequence or just a metaphor for his multiple identity disorder.

Trivia

 * This Quirk is functionally similar to Clones, as they both revolve around creating duplicates out of a viscous liquid. There are a few key differences, though:
 * Ectoplasm can only make replicas of himself, whereas Jin is capable of making doubles of anyone, including himself as well.
 * Ectoplasm can create up to 30 (36 at best) clones, whereas Jin is limited to only 2 clones of other people. It is worth noting that Jin can create as many clones of himself as he wants, as those clones can use their own Double Quirk on themselves to continuously multiply while bypassing the 2 clone limit.
 * Ectoplasm's clones can't use his Quirk, whereas Jin's clones can.
 * Ectoplasm can create a massive clone of himself, whereas Jin hasn't shown such an ability.