I am pretty sure blondie was supposed to be an omega. But bc the mc bit his ear when they were kids and exposed him to excessive pheromones blondie manifested an alpha. The mc is an omega but is considered a recessive omega bc he has a very weak pheromones which is why he thought he was just a beta.
Blondie didnt have a secondary gender and everyone assumed he was an omega because of the pretty face/small frame. MC and ML awoke their true secondary characters together with a partial marking which turned blondie from alpha to dominant alpha due to the pheromone issue he had from partial imprint. MC is a recessive omega who only reacts to ML (i think)

Don't know if I'm just slow but is he an omega, or an alpha, or an omega who turned alpha? I don't get it. And the bottom is an omega or a beta? I never read an omegaverse that was this confusing. Ngl I started to question my english skill...