Echoing Summon - account advice
Having recently returned to SoC (left around the Hasna banner) and enjoying the game quite a bit, I've decided I'll grab the Echoing Summon from the shop in order to strengthen my account.
I'm aware that my line-up is heavy with physical damage users and little in the way of magical or piercing damage, so it seems logical to want to balance this out.
I'm keen on the Union faction and enjoy the idea of running a Union team, but I understand the benefits of using mixed teams and that running a faction line-up is rarely optimal.
The three characters I'm tempted to go with are:
Kvare
Seems to offer both magical and piercing damage whilst also covering my lack of Aoe damage users (I've only just pulled Nydia). He seems like a solid unit that will be used in most content.
Tristan
Very powerful Aoe damage but also seems to offer magical damage (as well as physical damage).
She's also a Union unit which lends itself to my interests in fielding a Union team.
Taair
Undeniably useful for NRG support, but also crit support and healing. Easily the least aestheticly appealing character of the 3, and the one I least want to go for, but the benefits are clear.
Based on my current units, which would you ultimately go with from the selector?