With the introduction of Bold and Vengeful Fighter, armor units now have four B-skills that they can use very well, the other two being Quick Riposte and Wary Fighter. Although armor units tend to be enemy phase units because of their 1 movement, you can make them good player phase units. Bold Fighter let them double when they initiate and gives them +1 special charge every time they attack, but that comes at the cost of not being able to ensure good enemy phase performance since they wouldn't be able to double back when attacked if they're slower which Arden can because Follow-up Ring works on both phases. Wary Fighter can keep battles being 1 turn per unit, so using Effie, she can destroy someone if she initiates and prevent herself from being doubled when attacked. She can still get doubled, however, if whoever she's attacking lives, has Quick Riposte, and has 5 more speed than her or if she's getting attacked by someone who has Lancebreaker or has and is in Brash Assault's range and has 5 more speed than her. There's a priority system regarding Wary Fighter that was posted on Serene's Forest a while back,
https://serenesforest.net/forums/in...s-and-whatnot/&do=findComment&comment=4823923, and is also detailed on its gamepedia page.
For enemy phase, then you're going to have to choose from Quick Riposte, Vengeful Fighter, and Wary Fighter. Vengeful Fighter is better than Quick Riposte because of its great health range, >= 50% HP to QR3's >= 70% HP, and it grants +1 special charge whenever the user attacks. The problem is that it's only found on winter Tharja, a seasonal unit, so unless you were lucky enough to get like five of her where one is kept for use, then Vengeful Fighter probably won't be a realistic option compared to Quick Riposte which is found on Deirdre, Dorcas, Klein, Leo, and Subaki, regularly available units. Wary Fighter was talked about and it just boils down to controlling the pace of battle and covering the speed of the user since most armor units don't have high speed.
Hector's in a weird spot where if you keep his Armads, then he has QR2 by default. In that case, giving him Vengeful Fighter would be like overriding it with an improved version and Wary Fighter negates it, so you're leaving him with just a 16 Mt weapon. Vantage is a simple answer and Bold Fighter could work since he would be able to double when he attacks and double back when he's attack so long as he can survive. A niche option where you need a +Spd Hector is Windsweep. Yep, you read that right. 28 speed isn't that great, but you can just slap Phantom Speed on him or run a different set of armor buffs, so he can get some speed buffs. The idea of it is that whenever Hector attacks, he doesn't deal with being counterattacked, and on enemy phase, he counters back because of Armads. Of course, it's a niche thing, but if you want to do something stupid and have a +Spd Hector... Anyway, part of me feels like when Armads becomes available for refinement, then there's a chance the developers might dump Vengeful Fighter on it as its unique refine option. Vengeful Fighter 2 has the same health range as QR3, but with the +1 special charge when the user attacks.
Weapons will be up to you, especially given how not all weapons can be refined leading people to opt for refined Slaying Edge+ or Wo Dao+ for Zephiel as an example. That doesn't mean they won't be able for refinement in the future. A safe option is to give the melee armors and Halloween Jakob a Killer/Slaying weapon.
For A-skills, Close and Distant Counter or Steady Breath and the Stance skills. Arden can also use Fire or Earth Boost since his HP is so damn high. CC and DC are self-explanatory as it helps them deal with whatever attacks them unless it's BH Lyn attacking a melee knight because of Sacae's Blessing and anyone with a Firesweep weapon or running Windsweep. Steady Breath would mainly be the Black Knight's thing since he has Distant Counter through Alondite, but that doesn't mean the others can't use them.
Another thing is Armor March. I've never used it since I never summoned Amelia, Halloween Henry, or winter M!Robin. Other than increasing their mobility, Armor March lets armor units pass through forests as if they were normal terrain. I don't remember the exact explanation for it, but just remember the in-game tip saying something about armors have the same movement regardless of terrain, so Armor March would mean they can move twice during the phase if that makes any sense. You will be giving up a stat buff, though, which is the same with if you have Arden running Panic Ploy or halloween Henry, Sheena, or winter Tharja running the other ploy skills, but it is an option.