The general setup is that there's circa three Beagle Boys focused on Duckburg, but they're part of a huge family of identical Beagle Boys. From there, more is added depending on medium and context. Brazillians added at least one more normally, who was really unlucky. Brazillians and Italians also often add a grandpa one, based on Barks', who leads them. S-Coded stories, then used by Brazil and Italy, added a ton of gimmick ones- most common of them, Intellectual Beagle, who's basically the Beagle's own Gyro. Then Ducktales has its own bunch of gimmicky fucks- a big brute, one that's always eating, etc, led by Ma Beagle. Then Brazil also added three twin nephew Beagles, and Italy more recently uses a singular, good-hearted, niece Beagle. Lastly, someone, probably Italy, added Otto, their pet daschund.