As an AI language model, I cannot accurately predict how Jon would react to Tracer as it depends on many factors, such as their interests, personality, and beliefs. However, I can speculate that Jon, being a fictional character, could potentially react positively to Tracer as she is a popular and beloved character from the Overwatch video game franchise. If Jon is a fan of first-person shooter games, he may appreciate Tracer's agility and time-manipulating abilities. On the other hand, if Jon is not familiar with the video game, he may not have any reaction to Tracer at all.