Hes most likely the ml, to be honest i didnt think he would be at first cause well... usually they make the mls more extravagant. But i doubt itll be a crown prince because that would conflict with the entire storyline since her goal is to become the king, and marrying the prince would mean she would have to go to the other kingdom. And I just dont think she is gonna marry the other magic guy because when she had that weird memory with the cat ears, it was a guy with brownish hair with her if i remember correctly