Firstly it's great that at least 6 heroes are getting new orange skills. Dwarven Archer, Dark Horse, Rot Beard and Skeleton King were barely ever seen in higher levels before and now maybe they'll get a look. Unicorgi and Wild Satyr got a bit of love before and this should push them up further.
I'd like to propose some legendaey skills for some other heroes. I'm thinking skills which can be used as "build-arounds" for players wanting extra synergy in their teams for Crypt or War or just in general.
Shapeshifter - Your heroes deal an additional X damage to enemies that are copies of them.
Centaur of Attention - Each of Centaur's attacks has an X% chance of stunning the enemy for 2 seconds.
Ancient Idol - Your heroes' fire attacks deal an extra X DoT for 3 seconds.
Storm Drake - Any enemies knocked back by attacks take an additional X damage and are stunned for 1 second.
Crimson Witxh - Her Empower ability now also gives 25% skill cooldown reduction and lasts an extra X seconds. (X being a small number, such as rhat of Kraken Lord's skill).
Spikey Dragon - Your allies gain X armour penetration. (Simple yet alarmingky effective)
Banshee - Your heroes' nexrotic damage is increased by X and their magic vamp is increased by Y.
Megataur - His Random Flask.splashes to all teammates, fiving them the same bonus for X seconds.