Disclaimer: I am not a lore expert by any means, and I am not saying that every army I list is feasible on legendary. Some armies are expensive; I do not care about multiplayer.
Time for the next segment on thematic army compositions! This one was actually requested, so here you go:
Orion gets the cavalry build. The inclusion of Great Stag knights actually made me want to play Orion again, and I thought that I was done with him.
Glade Captain on Great Stag
Wardens of Cythral
Wildwood Rangers x5
Wild Hunters of Kurnous*
Wild Riders x3*
Lost Sylvan Knights
Great Stag Knights x2
Glade Riders (Hagbane Tips) x4
*Edits due to the input of John_Kimble, Zekerath, and Helhound
If zoats fit any of the WE lords, I feel like it'd be Durthu. His army lacks ranged units, but at the risk of being too similar to Drycha's build, it really felt like I should keep elves out of his forces.
Great Eagle x2
Enigmas of Ghyran
3) Sisters of Twilight
Probably the most traditional-looking build in the thread. The hawk riders for the Sisters are amazing and act as the forward ranged units; the deepwood scouts can be used like traditional missile infantry, firing from behind the melee line.
Sisters on Ceithin-Har
Glade Captain on Great Eagle
Deepwood Scouts (Swiftsilver Shards) x3
Hawk Riders x4
Sisters of the Thorn x3*
Great Eagle x2
*Edits due to the input of Helhound
Drycha's army is one of the easiest, as she gets units all to herself. Her entire army aside from the Dryads RoR is exclusive to her campaign. I've selected the spiders and hawks because they are fast units to compensate for her lack of ranged units. The Wraiths seemed appropriate with Drycha rather than with Durthu.
Malevolent Branchwraith (Life)*
Wraiths of the Frozen Heart
Malevolent Dryads x5
Giant Spiders x3*
Great Hawks x2
Malevolent Treekin x4
Malevolent Treeman x2
*Edits due to the input of Zekerath and Helhound
Thoughts and opinions? I paid the price for not looking at the skill trees before I posted this, so I've already made a few edits based off of community input.
Links to previous lists:
Vampire Counts https://forums.totalwar.com/discussion/288074/my-take-on-thematic-army-compositions-vampire-counts