>>3248>it had me rooting for both the antagonists and protagonists, something I rarely seen pulled off (the only other series Ive seen being dorohedoroFunny that you mention this because Dorohedoro and GK are my to-go examples whenever I talk about that stuff. In that sense I fully agree!
It's sadly very rare but it's such a pivotal part of story telling for me it largely determines whether I get obsessed with a series or won't care. I usually end up preferring antagonists anyway, so making them mains with own arcs and PoV is a god given blessing for me.
What both series do especially well is that they also mix and develop every group and individual. There is no a status quo everything has to return to. The groups you assumed to be fixed break apart in the course of the story, characters betray each other, enemies befriend each other, switch factions, come back or go solo. Then there is the development most of the antags had in relation with Tsurumi, especially Tsukishima and Koito.
It's fantastic and makes a series so much more interesting and varied if you aren't forced to stick to the same MC and dynamics for 20+ volumes. Nothing makes me angrier than a series that has the interesting things happening off-screen because the PoV can't detach from the central protags or long-running manga that never change anything about their side characters.