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Okay finding something you don't know is barely impossible as you're on the same Bastion level as me. If not more because you've got CN access.

Angels (Diablo) vs Kyrian

So I'm going with every similarity I can find between Chris Metzens winged OCs. Note I've not played D4 which came out after SL so there's probably references in there too.

Kyrians started off as basically Auriel. Kyrians where described as being beings of pure energy including their wings. Later this would be anima and changed that they very much are flesh and blood in the Shadowlands.

Blizzard even acknowledged this in Heros of the Storm where Auriel got a Spirit Healer skin.

Both have five virtues with Angels having: Valour, Hope, Wisdom, Fate and Justice. Kyrians having: Courage, Purity, Wisdom, Humility and Loyalty (later Devotion). Who are lead by one guy Archangel or Paragon.

They both have someone who's part of the main 5 guys who becomes a villain and is purple. And changes their title to something else: Angel of Death and Paragon of Doubt.

They got some evil fucked up version created partly by said guy who turns evil. Reapers and Mawsworn (there's also the Forsworn but that is different.)

It's implied the Paragons have unique artifacts. Only Compassion (Chyrus sword) being named in one quest and then he's never seen with it again. And exclamations like 'By Xandria's spear!'

Xandria, Paragon of Courage makes ab explicit reference to Imperius, Archangel of Valour with her joke line:

Imperius: My old enemy. You cannot hide from me, no matter what form you choose to wear. Let your true self be revealed... Diablo!

Xandria: My old enemy. You cannot hide from me, no matter what form you choose to wear. Oh it's you-- Nevermind.

There's also like the whole thing of them both using Ascention but for Kyrian it's like their whole thing.

The Library of Fate and Eonian Archives (Temple of Wisdom) are basically the same thing.

Okay I forgot about fallen angels which is also a thing with Kyrian. Being fallen isn't always Forsworn but often is in Shadowlands.

I did check for battle pets and name references but I didn't see anything yet.

Larion could be a reference to Solarion but i think that's just a coincidence.

i think my mind was doing more of a everyone is dogs and some people are cats type deal

Lorath deserved love, Lorath craved love, Lorath hoped that love can fix him and make his trauma go away, he wanted stability and he wanted the safety of a home, which was ripped away from him. In "The Lost Horadrim" he has so much anger and he lashes out at those he loves, Tyrael and Donan.

Pairing him with a girl who is going through her own problems and does not have the patience and kindness that Tyrael and Donan have towards him, did both of them a disservice. If this was played as a absolutely unfitting romance, a literal one night stand that left both of them even more aware that they cannot have a normal life, I would be down for it. But this cannot be a genuine relationship, and I'd like to think the authors were not going for one.

Lorath is in love with the idea of an Adreona that can save him from himself, but that Adreona does not exist and they would both have to be different people for it to happen. That's the tragedy of it, that's how this story ends.

And if played straight this relationship is the worst of the 2000s/early 2010s hetero ships in action/adventure media, where the far more competent woman has to deal with a guy who she can barely stand, until he proves to her that he is better than she believed and she instantly rewards him with romance, a kiss or sex depending on the rating (you can see this in stuff like Eragon, How to Train Your Dragon, Wanted, Transformers, Ready Player One, etc).