yup, that's a very nice background 'illusion' there. At first, I just realised the black cape as the 'evil' wing and JUST that, doesn't realise the rumbles at the back as the angel's wing...but yeah, the symbol for Kamui's and Fuuma's group (as tower people) really represent the X-theme. The tokyo tower, the white and black wings and the number 0 and 7 in Kamui's symbol ( the seven seal, dunno about the 0 part).
I wonder why the others have Kamui's symbol from his neckace on the shoulders of their cloaks though, just a coincidence?
At first, i thought the symbol belongs to Kamui's group, but when i saw that Subaru also has that necklace...i kinda confused again, because it seems that this ymbol belong to SUbaru and Kamui's alone, and the people they are with maybe doesn't have any special symbol for the government building they're living in unlike the people in tower , so they just take Kamui's symbol (considering him as a leader??)