It seems that everyone else has been doing this too so here are my opinions of the units that made it to the polls:
Blood Hawk
by the fish
-All birds could have those abilities, not only this one.
-Not only 'could' but they should have them.
Divided Soul
by Verdian
-Quite sidar-unique, another possible way would be to have reveal/hide spells for the sidar which they can use to change from physical to shadows and back.
Ghost Pirate
by khanjackal
-Might work as a shadow pirate but not as undead.
Mana Freak
by Arqane
-with affinities to several mana this one could be a completely insanely crazy unit. So exactly fitting for the Balseraphs.
Mime
by Black Whole
-Good as another crazy Balseraph unit.
The Restless
by it-ogo
-Good as an idea but not exactly canon and might be exploited.
Trickster
by Sureshot
-If it keeps all its skills when becoming an assassin it might be overpowered.
-But making it paraller to assassin would balance it a lot.
Wild Mage
by Randolph
-Adds a whole lot of luck in the game, so definitely a well-working Balseraph unit.
Will'o'wisp
by Cadaveres
-Another shadowy sidar, would be a good flavour unit if balanced.
And now the wonders:
my Arcane Academy
-When thinking now The Academy of the Caswallawn might work too if not too Amurite-biased
-and a magical waste leak (=nuclear meltdown for effects) might be an additional flavour
-I tried to give this as much flavour as possible while keeping it simple, all that reagent/culture stuff might be unnecessary
-How about negative culture???
City of a Thousand Slums
by Kol.7
-My second favourite, the Kuriotates won't be likely to build this but when they do they would need additional effects that don't unbalance the game too much
Conclave of Blades
by TravellingHat
-Another good idea of empowering magical units, in a bit different way
-If both the Academy and Conclave were implemented as mutually exclusive wonders it might make magic specialising to the power of two
The Holy Ale Great Brewery
by Pandemonis
-Definitely the greatest wonder of these if you ask dwarves
Mirror Mirror
by formless blob
-Again Kuriotates issues: will settlements be counted or not?
-If will, then it'll a source of infinite gold
-If not, it will be useless
Pan's Meadow
by Rex rgis of Ter
-The effect should be restricted to the building city only, to avoid über-elves with tons of food, gold and production from their forests.
Port Royal
by Frozen Vomit
-Seems good but I'm a bit doubtful about its suitability for FfH universe
Sacrifice to Bhall
by CXDamian
-A way to get peace with barbarians would be nice
And finally events:
Bring Em Back Alive
by charleswatkins
-If rare animals keep rare this would still allow the Great Menagerie, so it could be even a bit more common
Commerce Feud
by Xuenay
-Realistic and has a lot of different possibilities
-Might mess your game up but hey, that's what feuds do
Glorious Combat
by Cadaveres
-Finally some reward for winning tough battles
-Another requirement might be less than 40% odds of victory to make it really glorious; winning an elite scout with a green phalanx isn't so much
Pining for the Fjords
by icantcmyeye
-Hasn't Kael promised to include this?
-As a once-in-a-lifetime event this would be a great easter egg
Turncoats
by blueparrot1966
-Tax collector is a good small event
-Gladiator might need slavery as civ X's civic
