Galrauch
Everything looks great.
Sigvald
Add: May always march, difficult or very difficult terrain is treated as open ground, and confers this benefit to any unit he joins.
Also, he has the "stupidity" rule; though he's not necessarily "stupid". ;-)
Valkia
Daemonshield: All enemy models lose an Attack to a minimum of 1.
Scarlet Armour: 3+ armor save, and any attack against Valkia has its Strength reduced by 1 to a minimum of 1. Note: the text indicates any attack, not just close combat.
Wulfric
Wulfric's armor save should be 3+/2+ (he has a shield)
Seafang: Wulfric and a single unit of infantry Marauders enter battle from a table edge. Roll d6 each turn to determine deployment: Turn 1 (5+), Turn 2 (4+), Turn 3 (3+), Turn 4 (2+), Turn 5 (Auto)
Kholek Suneater
Add: Scaly Skin (4+).
Armor of the Storm: Lightning-based spells targeted at a unit within 12" of Kholek target Kholek instead. (removes ambiguity)
Herald of the Tempest: During the shooting phase, on a 2+, a bolt of lightning...
Storm Rage: Lightning-based attacks against Kholek cause Frenzy.
Scyla Anfingrimm
... may roll on the EoG table after killing an enemy character or Large Target.
Vilitch the Curseling
Add: Ward Save 6+
Has two hand weapons... should he have an extra attack? (Doubtful)
Festus the Leechlord
Use this text:"The Will of Chaos, Eye of the Gods, Regenerate, Mark of Nurgle, Poisoned Attacks, one of his two spells is always Curse of the Leper, any pursuit uses 1d6", captured units are worth double victory points. Units he joins gain Regenerate on 5+ and Poisoned Attacks." (Separates his abilities from the joined units')
Throgg, King of Trolls
Regeneration, Mutant Regeneration (Roll on the Eye of the Gods table for any 2+ wounds regenerated per phase.)
Add: Will of Chaos
That's it for the heroes!