Late to the party, but better late than never? <3 Also placing all my babies in a single post. I'll gladly thread with any!
Thor Filled with fury at the loss of Sif earlier in the year, then Katherine, as well as friends, Thor fights with a rage and vengeance. You'll see streaks of lightning across the battle field and I would like to think as he plows along he would provide backup and assistance to anyone he passed by.
Rhysand At some point during the fight, Rhysand became the sky, shadows, and stars. He fought with every ounce of magical power he had (which, at least by measurement in his own universe, is quite a lot) to protect any weak points not covered by another guardian. He would have been in tune to the radios and arrived almost immediately to anywhere that called for help if he was available to do so.
Kylo Ren Fought outside of the temple to keep whatever he could from getting near, or forbid in, the building. He's needed to blow off some steam, anyway, so he fought despite having originally told others he would not participate. The chaos and battle had been fairly therapeutic for him.