|This build utilizes specific skill interactions to turn Hector into a powerful enemy phase tank that can never be doubled bar Axebreaker.
The Wary Fighter 3, Quick Riposte 2 effect from Armads, and the Quick Riposte 3 seal interact in such a way to allow Hector to only get attacked once and then attack back twice. This is because Wary Fighter 3 cancels follow up attacks from both units. The Quick Riposte 2 effect from Armads then breaks the symmetry, allowing Hector to follow up attack if he makes the speed threshold. Then, the Quick Riposte 3 seal changes Hector's ability to double from a speed check to a guarantee, while leaving the enemy unable to follow up attack.
Because Hector is guaranteed a follow up attack +Atk -Spd becomes the best boon/bane set to maximize his attack while dumping his speed, which isn't used in this set. Any other boon also works to help Hector stay in range as well.
Armads is the weapon of choice, as it provides Quick Riposte 2, which is vitally important for the build.
Swap and Pivot help Hector's mobility, which is important especially if you don't have access to Armor March 3
Moonbow allows Hector to always fire off a special in combat, and the defense piercing is more useful than the increase in damage dealt by Glimmer, as squishy targets already are eliminated by getting hit twice, leaving only tanky targets as threats.
Distant Counter allows Hector to counter any unit, and he even comes with it!
Wary Fighter 3 is what allows Hector to not get doubled by enemies, cancelling their follow up attack.
Hector's C slot is fairly flexible and is dependent on what your team needs. Ward Armor is a good budget option to help make his armored allies sturdier. Armor March 3 is very strong if he is paired with another armor unit, while Panic Ploy 3 allows Hector to leverage his large HP pool to debilitate his enemies.
Quick Riposte 3 is the only seal for this build, as it turns the speed check from Armads + Wary Fighter 3 into a guaranteed follow up attack.