Collete is a new Chromatic Brawler that will be available on the next Brawl Pass.
Her main is unique in the game: the damage she deals is based on the current health of her target. So if she attacks someone like Frank or El Primo, she will do a lot of damage, but if she attacks someone with low health, she will do little damage.
The damage percentage was not revealed yet, but calculated by the promo video, she deals around 35% of damage.
The "problem" of this attack, as it was shown on the Brawl Talk, is that if she deals damage based on the target's current health, she will never be able to kill any Brawler. If the enemy has only 100 HP left, she will make only 35 HP of damage.
On Boxes, she makes a "flat rate" damage, always dealing a fixed amount of damage.
Her Super is a bit similar to Bull's Super: she will dash forward around eight tiles, hitting all enemies on the way. The difference is that not only she dashes forward, she will also come back to her original spot, hitting all enemies again. This is somehow similar to Carl's axw.
It's not clear if she will be able to break walls or if she will knock down enemies.