Heinkel has Ironclad (150% defence for one turn), usable at any HP. He also has the Protect Ally passive, except his works for allies of any HP level, meaning he'll always cover physical attacks aimed at his team. (Dungeon boss hype?) He won't use Brave if he has any allies alive, if you want to hold him to that, though it's irrelevant in a duel of course. (It is absolutely not worth it to leave his allies alive in-game if you have any choice.)
Also Holly has Protect; just noticed that isn't listed anywhere. I didn't think to note my attack at the time... Protect's not really that great with her measly 5 Def but it could make blitzing her with physicals a little harder? Only a little because she has to keep refreshing it every 4 turns.
Victoria's Corpse can't miss (or it went something like 40/40 for me anyway).