(Bless his heart, he is. Kinda want to have him end up in a scene with some edibles and just end up giggling at nonsense, just to see it happen. The actor or your chara :D )
Markus would try to learn a lot of how-to-hero from Mitchel and look to him for pointers, but he would also be great at being underfoot or making mischief to irk Mitchel.
Zach would be chill and easy going DOW member to Lila, maybe poke at xer when xe is grumpy or in a mood. He is real hard to kill, so damage isn't a problem, maybe whining when his phone keeps turning into a brick.
Lukas and Zach might have bumped passed each other over the years. Maybe Lukas has accidentally mis-classed Zach as a contagious or feral Lycan and hunted him for a bit. Zach would be offended at the accusation of biting people and the whole silver-pointy-things.