LET'S TALK ABOUT JIN BEING SMART!! Okay, So Double Clearly Has Two Things That Mechanically Affect Jin.

LET'S TALK ABOUT JIN BEING SMART!! okay, so double clearly has two things that mechanically affect Jin. One, he clearly has an amazing memory - think about all the numbers he needs to replicate someone, I think it makes the quirk similar to creation in that he needs a lot of info prior to doubling, but outside of even how Momo's quirk needs chemical makeup, Jin essentially converts the measurements into something visual and spatial. So, just based on that, he should be one of those people who very vividly can picture stuff or draw up a map of something based on numeric values.

In additional to a great memory and spatial intelligence, he also clearly has to understand people really well. Don't forget, he's also doubling personalities, which can be explained as scifi mumbo jumbo, I think would require really understanding people around him.

Despite Jin's loneliness and trauma clouding his judgment, I do want to say he understood Keigo and his loneliness very well. It's no coincidence one of our first insights into the society at large post-Kamino was Jin reflecting on the current state of society, and 115 absolutely makes it clear he's a far deeper thinker than his illness allows him to express. So, while it's all inward, I just think there's an incredible depth to how he processes other people (and events/society in general). And it's a natural sort of thing, not something he was taught to do. Really one of the cooler characters in this manga and very well-written!