Kinda looked this over a bit, & thought that these needed a Status to Counter their Counter-Part Lines' Status.
This is why they Should Cause Stun:
-Supernova Stuns because the Explosion Knocks them back so Hard; Gets Moderate Stun
-Neutralizer has the same Effect as Supernova; Gets Minor(On Regular) or Strong (On Charge)
-Callahan has this, why not an Iron Slug?; Gets Moderate (On Regular) or Strong (On Charge)
Of course, this will leave Valiance out, due to it not having a Large Impact(Unless you Count the Charge Attack an Explosion), so that may be a Balancing Issue, so I'll(Or maybe you'll) have to Find a way to make it Even with them.
(I just Happened to be Bored at the Moment, so Agree or Disagree, I don't give a Hoot.)
Dude...
"I just Happened to be Bored at the Moment, so Agree or Disagree, I don't give a Hoot."
Did...did you just...
DUDE.