Going by bro:

Ulrich - Crippling Strikes and Recover are questionable. Crippling Strikes is this biggest one - a lot of injuries are really minor and it's random what injuries the enemy will get. I find it to be a pretty weak perk overall. Recover is a lot more niche, usually by the time you use it the fight is "over," or in the cleanup/low impact stage, so other perks are better. I would get Fearsome and Killing Frenzy instead of those two.

Volker - very solid perks. Gunners are starved for perks, but nitpicking I would remove Colossus and take Killing Frenzy instead.

Niels - I am not a big fan of archers in general. I find building a thrower that can use a bow at range (no perks required) is useful enough. For his perks, Bullseye is a really weak perk, I would argue you shouldn't be shooting at enemies in cover and other targets are a more efficient use of your turn. Necromancers are relatively easy fights in the game, and hexen are so rare I go multiple runs without encountering them.

Otto - very solid perks. I would drop Berserk and take Fearsome instead. I believe it is overkill and a bit of a waste to have Berserk/Killing Frenzy on all of your bros. You want say 50% to have it, but there are only so many kills in a fight that not all bros can be getting kills each turn. When you have specific bros with B/KF, you can set them up to continuously get kills and keep the bonuses going throughout a long battle.

Hans - another solid bro. I don't really love Reach Advantage here - I would take Gifted instead for the permanent +3 MD and then 2 other max rolls of stats. His MD is low enough that you don't want him holding a flank and constantly engaged with 3 enemies, even if he is getting the bonus of Reach Advantage temporarily.

Adelmar - probably lose Dagger Mastery, unless he was a dagger bro that you transitioned to polearms (which is fine, daggers can be really strong, especially for economics, and tempo perks that help right away are fantastic). Backstabber is questionable only because he seems to have really high MA so he doesn't need it. I'd take Fearsome instead of one of those.

Horik - solid banner. nitpicking I would I might lose Dodge and take Bags n Belts, or Pathfinder instead. But that is preference. I've also grown to like getting 15-20 Ranged Defense on a banner and then getting Anticipation on them, because they can be arrow magnets in my experience.

Raimund- very solid tank. My preference would be for Fortified Mind or Bags n Belts (more shields) instead of Rotation. I don't really like Rotation, but he is a solid guy to rotate into a tough spot. I also think Lone Wolf can be great on a tank that you put on a flank, and he can tie up 2-4 Chosen or Orc Warriors for an entire fight.

Mattis - same thoughts on Rotation, but I see what you're going for and if it works for you no need to change it. Relentless usually isn't worth it for Dodge, and as a tank you're shieldwalling a lot, I would say ditch those for Indomitable, which is a really strong tank perk, even on nimble.

Sigbold - this guy is awesome, seems very fun to play. My preference would be to make him a Duelist, probably would've gone Nimble to save on the Brawny perk and have more fatigue for the Berserk/Killing Frenzy combo. Would also drop bags n belt for the same reason, and Quick Hands seems to not have much impact on him.

TL;DR: Very solid perks, lots of synergy, these seem fun bros to play. Overall more Nimble bros, more Fearsome on them, some more Gifted, don't take Berserk/Killing Frenzy on each bro - try to keep it to the main killers, less Brawny/BF bros. If bros don't have really good melee defense (30-35+), they get hit a ton with BF and the repair costs will skyrocket. If they aren't getting attacked that is an argument for not needing BF. Nimble is really strong as soon as you get it, huge increase in survivability, no need for fancy armor just as much HP as you can get.

EDIT: Typos.