Each of the independent army groups has its own banner, whether they're actual armies like the guards of each house in Verlaine and the Embellian army or tiny little groups like Mizer and his merry band of bounty hunters.
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There are a couple of unique flags for Pamela, Nessiah, and Marietta, as well.
And yes, that is Brongaa rampant on the Bronquian flag. Just like that is Mulminams the phoenix, as in the one depicted on
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the Crusade card that shows Paltina, apparently (though it can be argued over) the first wielder of the Gran Centurio
on the Fantasinian flag.