Violet: Her primary class should probably not be sniper if she only has 2 DEX but 5 SPEED, as snipers have low SPEED. Other than that, it seems fine, so let me know when you're completely done.
Nathaniel: Centrifugal precision will last 2 turns, but each stack has its own duration. I like his semblance, I think it's unique; other uses could be using his revolving objects as shields and whatnot, or launching them with gravity dust. Note, minmaxers get punished.
Gregory: For the love of all that is good, please reformat your sheet to resemble the format I made. Also, you may only have up to 5 in a stat, 0 dex means you probably wont hit much, and once again minmaxers shall be punished. Stat your other shit and fix it, because overall, this sheet seems very half-assed.
Argent: If I'm aware, his first perk is pretty much prestidigitation? Other than that, seems fine. And by his second perk, do you mean activating dust?
Reynad: Add your trait text to your weapon instead, since traits don't have conditional values. Other than that, seems good.
Goldy: Dodge perk seems very powerful. Instead, consider it blocking and taking half damage. As for her semblance, this is obviously very strong, so change it so that instead of doubling the effect it increases the grade by 1 or 2, increasing its dust capacity cost as it would increasing grade.
Orchid: Make her trait give -4 health instead, since just -1 health for 5% more crit chance is pretty stronk. Also, Into Darkness is completely out of the question, triple damage is too powerful considering her massive crit chance. Considering how much damage people do, aura and health might get a buff perhaps. Tell me once you fix it.
Fontanne: I like the idea of using aura for her abilities, and seems to be a worthy trade off for extra anti-tank damage. If you wish, give Lifeline a buff, as it is very conditional. I think her semblance is balanced, since the net +9 stat increase is very situational, but ask Projeck for his input. Another note for having two weapons, switching between them may reduce your speed since you have two. Other than those, she seems okay.
Please tell me if I missed anyone. PM me any changes, and I'll give you personal responses.