I think in five or six years we'll have enough distance from it to remember all the discomfort and isolation to be thankful that we're not there any longer.

Leanansidhe is another candidate. And Maggie is being groomed to be the Winter Lady.

I think Mab's instruction to not feed on her knight is going to lead Lara to feed on the mantle instead, infusing her with Winter magic, and drawing her closer to fae. All it took for Molly was to be instructed by Leanansidhe. Close association with the fae seems to be the key to making on a suitable vessel for fae power.

Lara has a couple hundred years in the court of a pack of vicious predators. She'd do okay as the Winter Queen. Maybe not the best choice for the BAT, but beggars can't be choosers.

Thought of another one, In Peace Talks, during the kraken attack, she was swimming with bull sharks. Aquamotion? I guess that's water magic. That would also be assuming those were Winter bull sharks, and if they were just natural bull sharks, animal control? Geez.

Lara gains A real ally in Winter. The White Court is the weakest vampire court that we've seen.
Lara and harry have been attracted to one another for some time. I'm predicting that it's just physical and once they have a chance to exorcise the hormones they're going to realize that they'll never work long term. That doesn't mean they won't remain married, but it will be a sham. A political marriage only.
Harry gains protection from the White Council. Or, I should say, more protection from the White Council. Since they're a signatory of the accords, they couldn't just go and off the Winter Knight. Just as Molly still has the Doom of Damocles over her head, the White Council would be idiots to try and prosecute that given that she's now the Winter Lady.
Harry gains by access to the Raith Library.
Harry is protected from Raith trickery because Thomas is in the big house on Demonreach. Of course that still leaves Malvora, Skavis, and Barrowill trickery.
Lara might give in to her demon and feed on Harry, but my prediction is that she winds up feeding on the Winter Knight mantle. Which will bring her closer to Winter and possibly make her a suitable vessel for fae power. Better than Molly, as Lara has hundreds of years of existence in a court of predatory backstabbers. Mab is always five moves ahead in her three dimensional chess game.
This will also cause Harry to be further on the outs with the Svartalves.
 

Fidelacchius. Butters hit Sanya with the sword and it did nothing. Then there was a long-winded explanation of how it is more effective against the supernatural. The sword can kill Thomas' demon and not Thomas.

Harry has one that Jim can endanger whenever he needs Harry to do something he wouldn't do,

Harry has two children. One he had with Susan, one he had with Lash.

Hmm, Odin uses soulfire to reunite a soul with a body to create an Einherjar. Odin uses soulfire to create a Valkyrie. Valkyrie are all of the Geats, possibly Beowulf, or Odin wearing a mask. Does Odin create a Valkyrie, soul and all from whole cloth? Or does he create a body, bind a soul to it and create a Valkyrie that way?

Because he's got Murphy's soul and body.