Mine uses the same build for Arena and All Doom Tower floors. Dark Fae is another story, but that's only because I have a saved team already and it's all Spirit champs so I wouldn't want to add him for negative affinity. I'd imagine he's fine against Dark Fae as long as your team is set up so yours always goes first.

An arena built Armanz will work wonderfully for Fae as long as he's not the one who gets stolen. I can't recall of the top of my head how Fae targets. Pretty sure it's the champ with the highest crit dam, but it might be attack

He also works great for clearing all DT floors. A lot of them he could solo ..slowly

Fae is highest attack, IIRC.

Can anyone suggest some numbers for his various skills?

Speed and accuracy is all you want for him. Make him as fast as possible, and with at least 400 acc. Ideally 280+ spd.

295 speed and 405 accuracy.  He is 2898 attack.  Will I need to do something to offset his attack in Dark Fae?

I was stuck on DTH72.  I took out WuKong and put in Armanz.  Now I am clearing floors in 3-4 mins.  I might even be able to clear DTH for the first time in a few days.  

Armanz is basically a cheatcode for DTH waves. Him + ACC up is basically all you need to clear them.

Just wanna add it's bs that he can place sheep while he's under an enfeeble debuff

..except when *mine* does it :D

My Armanz is doing everything except placing his stun most of the time.  lol

I have Padraig, Kimi, Razel and Klodd.  All offer AoE 30% inc speed and 50% inc accuracy.  Should I team them with Armanz for DTH floors?

Looking at random high-level hard Dt stages, it looks like the highest acc you'd need for waves is 390.

So if yours is at 405 now, than other for bosses he won't need an acc buff.

You might consider a different affinty cc champ as a partner in case of weak hits; Yakarl with his freeze for instance.

Lydia is useful for her def down, weaken, and blocking revive on the waves with Rotos and Siphis, also Tormins.

Just add a strong nuker, like monkey, and you should clear all the floors no problem.