I think that once you really stop to consider the urgency of the situation and can sympathize with them that they'll seem less like edgelords, and more like people who got sucked up by a giant space squid, violated, and had a time-bomb strapped inside of their skulls and are just trying to cope with it.
Not really. I do not refer to them as edgelords because of that, only because of their backgrounds. Their backgrounds are all very extreme and flamboyant. You have the over the top vampire, the bitchy sharran, the bitchy alien, the one becoming a 'destroyer of world's, and Wyll seems the most balanced but I honesly haven't interacted with him much yet, it's on my to-do list.
All those things are fine, my only problem with it is that they are all leaning towards the darker shade of grey, with a notorious absense of a more simple, humble companion to even things out. They're all competing for the spotlight, so to speak.