The pause screen feels more like an angsty kind of edge to me. The fusion stuff is more like the "look at how badass and dark this stuff is" kind of edge. It's silly and pretty easy to do it wrong, but edginess isn't necessarily a bad thing so it's all in the execution for me.No pun intended.
I don't really see anything as being edgy in P5. It just feels like they're having fun with themes and styles they could only reasonably work with while they have the Phantom Thief thing going on. Everything with the menus and the velvet room makes me think the developers are having a ton of fun with it all, which isn't how I'd describe something that's edgy.
A Persona game with Phantom Thiefs is a dream come true to me though, so it might be hard for me to view anything negatively at this point.