With Bernie buff after rework, I feel that Willow is stepping into Wendy footstep and it's quite sad since she possibly could do many things with fire mechanics.
One of the perk I could think about is she could extinguish fire in small area instantly with the cost of 30-40 HP. Even cooler, it could work like Dumbledore's Deluminator, capture and release fire at will at close range. If she did not release the fire stored in Deluminator in 10s, it will be exploded and damage her. Or this could be done by herself or her lighter.
This would make her a very valuable asset in team play, especially in the newbie team when they need to deal with summer fire (less depend on flingomatics)
What do you think?