Or you could just call them Dante and Vergil, since...you know...it's their names.
But anyway, I don't see how fans of the old series(which mainly comes from DMC3) can complain about enemy variety in this game. The Hells of DMC3 each only had two attacks, and only one of them were unique to each. The Abyss had a few extra attacks, I think. The Vanguard was a more upper tier enemy, so of course it differed. The rest of the enemies were embarrassing aside from the Fallen and Arachne.
DMC4's enemies were simply rehashes of DMC1 enemies, plus the weak human-made demons. But even so, due to the rehashed DMC1 demons, DMC4 had a good variety, IMO. In turn, so did DMC1.
DMC2...actually wasn't too bad, but there were countless clones. It's like there were families of demons lol. But they weren't really that bad thinking about it.
In DmC we've got the Stygians(weak, stronger, upper, and another variant), the Knights(which are practically just Stygians with shields), Ravagers, Pathos(Arrow, Bomb), Harpies, the witch, Rage, Tyrants, and more we don't know of.
Idk, but that easily trumps DMC3's enemies. DMC1(and by extension, DMC4) and DMC2 is more debatable.
The thing is, that the DMC3 enemies were distinguishable by their AI/behavior and animations, DmC's look like the same enemy just bigger, differently colored and shielded with a different weapon.