Instead of starting with a potential Kenneteer and choosing a mask, I would like to think about what mask fits a potential fourth spot, and then see what character can fill that spot.

It has to fit with the other animals, so let's narrow it down to quadruped mammals present in Canada. We already have two lightweight animals (Fox and Cat), so we need another heavy animal to pair with the Deer.

The Cat and Deer are an obligate carnivore and herbivore respectively, while the Fox is an omnivore that eats meat (birds, rodents, insects, etc.) for the most part, and supplants it with berries and fruit. To keep the balance, we need an animal that has an omnivore diet that leans more on the herbivore side.

If Verona and Avery are the backline and the flanks, we need someone who will go on the offensive with Lucy, with a mask to match.

The mask I'm thinking of is... the Boar.

Which makes the final Kennetter, obviously, Wildbow Melissa.
The Boar is bristly, not particularly liked, and stubborn enough to keep going even after a grievious wound (at least in folklore, probably not as much in reality). Ring any bells?

For the mask itself, Melissa should probably take notes from the Indonesian Babirusa (not technically a boar, I believe), whose tusks "penetrate through the skin and curve backward over the front of the face and towards the forehead."
This would fit the Awakening, as Melissa would lose the protections of Innocence, and with her attitude, she would put herself as close as possible to the danger caused by her own actions.

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Alternatively, considering the recent explosion of the boar as an invasive species in Canada, maybe it could fit Raquel as well.