Distant Counter candidates

Depends on where you're playing these units. DC isn't going to help Eldigan or Sigurd do much against say...arena reinhardts.

All armoured units are good candidates as DC stops units kiting around them. From the ones here, I'd say Amelia is pretty good user, despite the subpar, because you can always get better ivs for her later.

One more thing DC conflicts with Sigurd's ward and hurts his overall survivability. So it's a double no-no for him.

If I'm going to be honest, either Gwendolyn or Sheena. Amelia is a good candidate but doesn't use it best given that her IVs for you don't have +spd, and she needs a slight speed boost to use DC optimally.

Gwendolyn can be a solid Horse Emblem counter with DC and Ridersbane particularly as Ridersbane can be refined to ignore horse buffs, and Sheena is a very good green that is tanky on both defenses overall.

Sigurd can benefit but DC can interfere with his B slot of Crusader's ward, and Eldigan just becomes pseudo-Xander with DC, though he can more effectively run higher CD skills like Ignis.

That sheena is very good, as good as the +def and - speed one. Give her DC, Bonfire, QR, and Ward Armor with DD seal.

Sheena. Those are great IV's for DC on her. Amelia's not a bad option, just less magically tanky, which is a big part of the use of DC. Ignis and Glacies (or Bonfire and Iceberg if you're running emerald axe) will do the same damage with that build, and Distant Def 3 SS will boost that too, so she can deal out a lot of damage while taking very little with DC.