I have nothing to do with the ideas of the people who answered below and want to say how I see this idea. Queens (or kings) can be added only to some species (maybe bees or anyone you want). I do not support the idea of "just make 'em bigger and here's an alpha", because I think it will not fit into the game. I think that alphas should be distinguished by clothes or something like that (maybe a color or a crown). I have not yet come up with the purpose of their existence, but ordinary individuals of the species can work for the alpha, collect resources. Alphas can be given special animations that can be obtained by mating with them. In principle, the player will need to interact with alphas for this. Also, I think this can give more extensive ideas for quests. If Alphas could talk and interact with the player, they could give tasks.