Iris

Iris is a seer. While she and Eva can both gain knowledge of the future, their methods are very distinct. Iris sees visions of the future, while Eva makes use of physical tools such as cards or bones, then interprets the results. Most people aren't really sure whether the results vary strongly, but sometimes one will send a dragon to the other if they deem the other's expertise to be more relevant to the situation.
Some dragons are of the opinion that Iris' methods are more reliable since she sees visions directly, where Eva's have to be interpreted. Iris has a respect of Eva's work, and is quick to correct anyone who makes this assumption, pointing out that her style of predictions is just as fallible as Eva's. Despite being called a "seer," she is not physically "seeing" anything. Since it all relies on her skill and her mind, seeing the future is just as much interpretation as reading the future.
On top of that, some of the materials and methods the two use have some amount of overlap- for example, both incorporate bones in their outfits due to the spiritual connections they contain. This makes any form of magic relying on spirits of nature or of the dead much easier.

Iris is incredibly old, with many years of practice of her trade under her belt. As someone raised in the water flight, she had access to many excellent trainers. One day, she set out on a pilgrimage to the Southern Icefield to hone her abilities. The frequent snowstorms and overall lower diversity of color in the frozen landscape were ideal conditions to focus on visions without her sense of sight getting in the way. Many seers must call their visitations off early due to the harsh conditions, but Iris, having a natural affinity for ice due to being born around the Crystalline Gala, was able to live there long enough to hone her abilities to mastery.

Nobody's quite sure why she joined up with this clan of all things. The most anyone has been able to weasel out of her is something about a vision she saw while in the Icefield. She showed up one day, introduced herself, and offered her seeing abilities to help the clan. Moving her in was exceptionally cheap due to how little she carried with her in terms of belongings during her training.
(I got Iris on the AH for 3kt. I have no idea why someone would sell her for so little.)