It's possible that there are also antagonists in the story. Maybe there are people who take advantage of the gambler's addiction, or those who oppose his way of life within the community. Without reading the full story, it's hard to be certain about all the characters, but the gambler is the key one we can be sure of.
Gamblers were greedy people. They always pursued more money and benefits, no matter how they obtained them. They like to gamble and always have the belief that they can win. They think that they can always win more money when they are unlucky.
The main characters might also include people from the gambler's past. Perhaps an old mentor who introduced him to gambling, or an adversary he had at the gambling table. These characters would help to build the world of the story and add depth to the exploration of themes like gambling, risk - taking, and human relationships.
There could be Ron. He might be Harry's sidekick in the gambling adventures, either joining him in bets or trying to stop him when things get out of hand. Ron's loyalty would play a big part in their relationship within the story.
There was a cute man in the novel, The Gambling Queen. He was a foolish emperor that everyone could bully, but behind him was a powerful force that could turn the world upside down. The relationship between him and the female lead was full of affectionate and loving details. Of course, there were other men, but in order not to spoil the plot of the novel, I won't introduce them one by one. I hope you like this fairy's recommendation. Muah ~😗