Good Close Counter unit?

Close counter vantage brave lyn to screw with the opponent

There are a couple of high def ranged units, that could be recommended.

Saizo, for example, is an absolute beast when it comes to physical tanking. He kind of lost his unique trait as a physical wall among daggers, when the new Xander got released, but he's still really good, especially if you invest merges into him.

Henry is most likely the best mage candidate for close counter. He can easily reach above 40 defense unbuffed, which makes his ignis procs kind of deadly.

Leon would be the archer variant. He has decent def and speed, which should turn him into a decent close counter tank.

Then you also have those absorb healer builds with CC.

Merric, Boey, Leon, M!Robin, Sophia, Saizo, Matthew, or if you're insane Lissa or Azama.

All of the above are ranged units with good defenses. There are more but these ones are the best candidates in my opinion.
Boey, M!Robin, and Sophia are all very similar mages but of different color. If you see a set on one of their pages, know that it will work with the other two units as well.
Leon is basically infantry H!Jakob (but with much less Res and some more Spd)
If you want more info on the units, just check their pages I guess.

https://fireemblem.gamepress.gg/q-a/best-recipients-dccc#comment-647846