So what's worse than a Dagger Linde+Gunnthra party???

That could work, personally I'm running Guntra with S!Catia, I gave them both home cavalry and Guntra just destroys even reds when 1 enemy is fully debuffed.

If only I had a Gunnthra... Why can't we get all the Nifl family free :(
But chose Veronica as my free unit (would have waited but no orbs and no money) and must say love her so much already

Ranged dancers are the only units with worse arena weight probably

If you use chilling seal on Gunnthra (which I think is a good idea) then you have a certain issue in that Veronica might need to spend turns healing Gunnthra for taking counterattacks, and whenever that's the case she's not debuffing. It may therefore be advisable to have Ares or Swordhart on the team to take advantage of the buffs/debuffs in case Gunnthra isn't in a position to follow up, whether because she's taken too much damage or because she's simply out of position (like, on the wrong square)

The other consideration is that smoke dagger debuffs harder and on our end of things we're probably already using hone cavalry.

Makes me think that Veronica might be most suited to a team that relies mostly on drives.