Blood elf leadership representation and champions has become a mess. They have barely any notable heroes and any that do start making a presence end up sidelined, depowered, irrelevant or dead.
Lor’themar has been the usual go-to and truth be told overused at this point. His story is now more focused on his marriage and the nightborne allies.
Shockingly enough, even someone as unpopular as Baine and the Tauren is getting more screentime.
Lathos Sunband was a great example of what blood elf representation and a hero could be. He was unfortunately killed off in the same quest line in order to propel the story of a random human character.
Notable blood elves that were cut:
Kael’thas: Not in the horde but the most notable Blood Elf concept we had. Made into a pinata.
Voren’thal the Seer : Considered one of Thea most powerful and wise Blood elves. Became non-existent after TBC.
Halduron Brightwing :Made a bit of a splash in Cataclysm and gone.
Rommath : Supposedly most powerful Magister and leader of the Blood Magi. Barely see it. Made a bit of a showing in MoP and gone.
Valeera Sanguinar : One of the best assassins in the world. Works mostly for the Stormwind leadership.
Lady Liadrin: Pops up from time to time as Horde representation but ever since TBC, has been losing her overall importance. In Legion her main importance was to have posters handed out.
Aethas Sunreaver : Once leader of a faction of Bloodelves in Dalaran, then cast out and made to seem like he was getting story development in MoP. Afterwards in Legion his only purpose was to get back in Dalaran’s good graces by giving them a legendary Heirloom of his people. Most recently he was found trying to find a way for Jaina to be his friend again after purging Dalaran…
Koltira Deathweaver: A once champion of Quel’thalas that fell to the Scourge. Returned after as a Deathknight. Last we saw he was captured by Sylvanas and freed in Legion. Nothing much since
The Windrunners: This one is a bit contentious but needs to be said. The original Windrunner idea was heavily tied to Quel’thalas. They were seen as champions of the land. With Sylvanas’ story gone to the dumps, that has now removed the last link to it. Alleria could have been a blood elf idea but was made with the void elf concept, so that is also far gone too. Windrunner heroism for blood elves has now officially been buried to the past.
Edit: Sorry for edits, keep adding notables that I recall.