Brazen Def Res

A tank, preferably with a Distant Counter weapon, but it's not necessary. Someone that'll be on the front lines tanking hits from enemies to utilize the extra defense (and maybe the extra resistance for dragons or mage tanking).

I highly recommend Zephiel. He becomes a massive tank once Brazen activates.

Any unit with potential to reach high res/def, such as Berkut, Sheena, Selena. Most armors fit that criteria nicely, manaketes even flyers/horses can benefit a lot from said skill. Non ifantry units will like it more than infantry since breath skills are, in most cases, are much stronger.

Like others said, units with lots of mixed bulk, and built-in DC is a bonus. My recommendations are:
- Nowi and balanced builds of A.Tiki and Fae
- res-invested Selena
- res-invested B.Ephraim
- Sheena
- Eirika or even Soleil with the right setup
- a number of Berkut's lance builds
- a number of wary fighter builds, because brazen is extremely likely to activate effectively

I excluded Hawkeye and +res Dorcas because those two probably want QR, which is usually out when brazen is active.

I gave that Skill to Catria. A +Res Catria is perfect.

Fjorm, if you want to switch up her skills from Atk/Def bond (which is still a great skill)