This is just a fun non canon idea. Lucy, Logan, and Marco come from their own respective arcs to fight for survival in a battle royal type of world. While Logan leads his team, Lucy the medic and Marco more of the tech support. (Yes call the nerd XD). Lucy doesnt like to fight but understands this is what she has to do to keep her friends/family safe. Logan misses his wife and kids, but will focus on surviving. As for Marco, it's nothing super new, but he is somewhat cautious since it's new territory for him. Wonder if they will survive.