If there are seven, then I will try to find their respective sins.



First one from the left looks like a former good guy. Maybe he lost his will to fight, or he became jealous of the vampires' power. Either sloth or envy.



Second one from the left has the whip, a scowl, and his left hand has webs around it (which catch things) and is in a position like he is trying to hold something. Either wrath or greed.



Third one from the left is taking blood-like thread from the second one's hand, and has a web below her, relating her closely with 2nd. Gluttony?



After looking at this for a bit, the 3 on the left seem to be related since 2nd on the left has his whip curling around the feet of 1st and 3rd.



1st one from the right looks like an annoying prick, but also a take-it-easy type of person. Sloth?



2nd one from the right has that pose, so I think lust?



3rd on from the right is big and has a big axe. Wrath?



Middle one is probably pride, due to her facial expression and how she looks like she is literally creating blades from thin air, implying she is very powerful.