I Want to Build a Normal Henry...

I think that the "optimal" build listed here on his hero page is generally a good idea to build towards. He has no speed, so QR is required and atk smoke C skill also helps him tank more stuff in one round.

I'm only kind of unsure about his special. Bonfire means a proc in every fight where he tanks and the enemy doesn't have guard, which overall means that he should be able to deal with his enemy in one round, whereas Ignis triggers in the second encounter upon his initiation (most of the time), but deals devastating dmg.

His atk is so low I prefer the Nogitsune school of Henry, just stack his def super high and go all-in on the special. You get to maybe 30 atk + 12 mt with a boon? I guess that's more than nothing and helps out the special (plus, lots of units have low res) but you will lose your guard and QR more easily. Choice is yours

While I much prefer +Def/Res (superboon), +Atk has it's uses. Should be up there, and your's is also -Spd, which is pretty much the only stat he wants to drop (unless he's solely a melee/physical counter).

If you're getting him CC, you may as well go all the way and get him Owl. It's a whole other level, since he actually gets to do what he's at (tank). +Res allows him to be a mixed tank, which is what I aim for. Best boon, for me. +Atk might work to 1RKO more consistently with Bonfire on top of Atk & Def buffs. It's actually not as useless as I thought it was.

CC Blade is also not a bad idea. He wants to be able to survive, so he prefers the defensive buffs over Atk (since Tactics) can still get him to oneround anyway.

Welcome to the Henry Club, it's nice to have you. :)

Henry, if built for it, can survive a hit from Reinhardt (Nogitsune can tell you more on this, but I can do the best I can).

IVs - For this, I honestly wouldn't even worry about his attack stat, at least not enough to go for an attack boon. His attack is kinda bad, and we'll just have to accept that, so I'd recommend going for a boon in either his defense or resistance, or even his HP if you so choose. Either of the three are fine.

Skills - If you're going with Close Counter for his A skill, then Rauðrowl+ is arguably the best weapon for him. Many will say that Candelabra is better, but that's locked to a seasonal unit that not everyone has access to. His B skill and Seal can be a few different things, and kinda rely on each other. Guard is a good skill for him, allowing him to take hits from units without fear of being blasted by things like Regnal Astra, Black Luna, Glacies, or even Astra. With Guard as his B slot, Quick Riposte can be his Seal, allowing him to double on enemy phase, and charge up his specials faster.

If you wanted to, however, forgo Guard, then Quick Riposte can be the B slot skill, and you can go with something like Close Defense (or Distant Defense if you want to go with a Mixed bulk unit).

His C skill can be a few different things. Panic Ploy is an extremely useful skill that can help him survive hits from units that rely on buffs. He can even survive a Reinhardt if he receives visible buffs and gets Panic'd (again, Nogitsune can tell you more on this subject). You could also go with something like Atk Smoke to help with tanking, or even Infantry Pulse (although I'm a bit iffy on this one, to be honest).

His Special can be either Bonfire or Ignis. I personally prefer Ignis. I'm gonna try to get my Donnel to get Infantry Pulse, thus lowering Ignis' cooldown so he can activate it on the first initiation provided that the enemy doubles him, and even without Infantry Pulse I still prefer Ignis due to how much damage he can do, able to tank hits from units like L!Ephraim and blast him to bits with a nice Ignis to the face.