Best Users of Brazen Atk/Def 3?

Usually any physical tank is a good choice. I put one copy on Gerome, and hes pretty awesome with it. It usually goes best on Cavaliers and Flyers, since they don't have access to Steady Breath, which is almost always considered a better option.

There was a question about brazen skills in general https://fireemblem.gamepress.gg/q-a/good-users-brazen-skills

It's pretty simple : Any unit with a good def and not bad/good atk is good with. Actually, I think the best users of brazen atk/def 3 are armored unit with bold fighter. But i've made a build with ares who have vantage + brazen atk/def and he is srsly amazing