I feel like Coil would be a very distrustful feral young adult and Medkit would just be very deadpan and calm but pessimistic father/uncle figure. Kind of like Hank from Detroit become human or Swansea from Mouthwashing. Over time Coil bonds closer with Medkit, since Med is basically patching him up everyday and Coil keeps tabs on Subspace. But then Medkit starts pushing him away in fear of the church tying Coil to him and dangling him over Medkit as means of manipulation, or even worse, them being interested in indoctrinating Coil into the family. Eventually Medkit completely ghosts Coil and they meet 3 years later in The Phighting! Competition, now imagine the angst...