I think I really like the Sun theme for Halla. between banish the night and its alloys, Sunfire, and her new Kenning of Sunshine, she really is starting to take on that theme. and it kinda fits, more then just fire I think. I mean, most everyone in our family is fire associated, but each has its own direction for it. Sten is Forgefire, Steinnar had Wildfire, Blackhand was Firestorm/Magma and Illimaren's fire. for everyone, Ignition is just the basis, with their own take built on top
and Halla is starting to reach that point too. her Ignition is really high(as high as Steinnar's, higher then Sten). but by now, with how many perfected tricks and how basic that stuff became, its just her form of basic attacks. not her actual 'specials'. Sunfire though can be that, in the future at least. and Sun in general.
I mean, it fits her pretty well. like the Sun, Halla is very good natured, supportive, and really helps people. she is a pretty peaceful person for a Norse, and she really leads and supports her people. like the sun.
but like the sun, she can also be terrifying and incredibly dangerous. invoke her wrath, and she will come down on you like the sun itself and drown you in fire and steel, so that by the time she is only ashes remain.
I really like that theme for Halla. and it fits with flying combat and her Skyfire thing too