The outcome of a hypothetical fight between Markiplier with a revolver and the Among Us imposter would depend on various factors, such as Markiplier's proficiency with a firearm, the imposter's abilities, and the environment they are fighting in. If Markiplier is skilled at using a revolver, he could have a good chance of winning, especially if he maintains distance and catches the imposter off-guard. However, if the imposter can get close to Markiplier or use its ability to sabotage the environment, it could give the imposter an advantage in the fight. Nevertheless, it's impossible to predict the exact outcome, as this is ultimately a fictional scenario involving fictional characters.