Amber Glass is an overly perky Terrareen vampire hunter. She's spoken with Jaina Jade in at least one solo story told at Pro, and seems to be keeping in touch with her despite any House Jade disapproval.
Amber may be a member of House Jade, same as Jaina was, despite not carrying the Jade name. This could be the case if she were recruited as a more-or-less adult rather than taken in as a small child. It could also explain her uncharacteristic optimism.