1. I'm not sure what you mean by clothing style. If you mean what sort of equipment is recommended, something that boosts fire resistance and physical defense would be helpful, but by upgrading your armor with jems, you could use just about anything you want.
2. I'm not saying no to the idea necessarily, but I feel that Bianca has gotten some of the most development of any other character in the game, aside from Mila. There will be a bit more content with her in the vampire route, but I feel that her story arc is complete.