Starline guild posting... 2!.. and 3. These girls cannot be separated!
Willow is a hot-headed, hot-blooded blunt woman, with flawless work ethics. Despite her rough and tough exterior, she cares a lot about the safety of her loved ones! Wisteria, on the other hand, is more reserved and polite, and she's not really expressive— but don't take that for a lack care or emotion. Wisteria is great at bottling up dealing with her emotions to help the people who need support ^_^
Both were orphans who were taken in by the Guild at kids, and grew to become very close to one another! That's why they're a package deal. Girl best friends. Willow has harboured a deep resentment of Polaris, while Wisteria tries to be the friend he needs in those trying times... Keyword on try.
Willow and Wisteria are both the youngest wizards in the guild at around 20 y/o (before Polaris arrives) and ends up as the most active, since most of the guild's other wizards have been killed, Injured, or just retired due to increased Hollow sightings. Wizards their age tend to be uncommon— at least on the battlefield. Most wizards are scholars or artillery, but the guild's are specifically train in handling hand-to-hand combat.
Wizards also tends to stick to one "domain" as their speciality, two if they're very skilled. By that, I mean that a wizard will be able to use any spells in that domain with ease, but will only have a vague grasp on how other domains work (think of it as a biologist having basic math knowledge, but being nowhere near the level of a mathematician).
In Willow's case, her domain of predilection is fire, meaning that she used and studied that domain so much she has an almost intrinsic knowledge of it. Her entropy is very low though— so she tends to compensate with agility and physical strength. Willow would be able to use simple spells from other domains though— because these are taught early in anyone's life. Something like... Making a small water source, or shaping a small rock— things that are practical!
Wisteria's domain is a little more unique : her spells rely on controlling organisms— her grasp on its mind depending on how conscious it is. She's able to manipulate animals scaringly well, but swore to never do it on humans. Wisteria's domain is one of the few that are frowned upon— due to its obvious moral implications. Wisteria always had an affinity with it as a high entropy user... Which caused her a lot of trouble as a kid. She's better at controlling it now though. Wisteria is perfectly able to use any other type of magic on a very basic level, but rarely does as it takes more energy to her.