What's your Alfonse build?

Hello!

It's the former benchlord's arena season again, and since I'm serving feathers and waiting for more copies of units before actually merging an arena core, and since as a f2p i'm probably going to need Alfonse anyways, I figured running non-merged Lector+Hardin+ H!Dorcas + Alfonse is going to be easier and more fun than the same team with BK over Alf.

So I just promoted the prince of Askr and I'm trying to figure out what skills should I give him.

-Folkvangr (def or res refine?)
-move assist (saving dual rallies fodder for the future merged core)
-Bonfire or Ignis? (Aether is kinda expensive...)
-Brazen Atk/Def or Fury? (I have 2 copies left of Hinata and Ares.) It seems like it's consistency in reaching the brazen state vs being a physical god once in the right HP treshhold (Brazen Def/Res looks nice, but it's 20K feathers I'm not sure i wanna spend...)
- Swordbreaker (fuck Zelgius/ BK) vs Vantage vs Desperation (the latter 2 have some synergy with brazen skills with their lower HP treshhold) (I have only 2 shannas left vs a considerably more Reinhardts and a few Lon'qus... I love my easymode blue mage but I think it's a better idea to merge some dragons, armors, Duel skill users or Marth instead...)
- Some poor man's C skill, probably Threaten Atk - I have like 8 or 9 Hawkeyes lying around but only 2-3 Kazes.
- The seal will be probably Close Def or QR. The new brazen atk/res seal is nice but i don't have the coins to upgrade it. As a new-ish player, I feel like I'll get more mileage out of the the Drive and Tactics seals... or maybe even the Savage blow one for some spicy AoE clears with pain+
(got QR3,DD3, CD3 and Drive atk3 as my only lvl 3 seals)
Same for the Brash assault seal- it feels kinda niche, I haven't forget it yet. I could kill a Bartre to get it as a B slot but i think the other options are better...

What do you guys think?