As I explained before, the best class for Yuri would be trickster. Although this is not really a surprise due to his luck and speed stats. We could consider the trickster class as his personal version of the lord class that the rest of the three main characters have. This is because while it is a class that any character in the game can access, it is almost tailor-made for Yuri, and even the only way to get it is in the DLC.