We're sailing on Allure in November, 2017. Do you know if any Trolls characters or activities are currently on Allure?
As of my knowledge, the Trolls Characters, Poppy and Branch, should be making appearances on your cruise. You will have to check your cruise compass, but they are normally out during the sea days.
As far as activities go, the only one I know about is if you are calling on Labadee, Haiti during your cruise. There is a Dreamworks Character excursion that is offered that takes you around the island to take photos of some of the Dreamworks characters (statues of them). This is then followed up with a dance party with Poppy and Branch. I have not done this excursion as walking around the island in the heat is a no go for my little ones. They had a great time though meeting Poppy and Branch on our most recent Harmony of the Seas Cruise.
That being said, your cruise compass will have the most up-to-date information about what is offered. It is possible something could be added that I am not aware of! Hope you have a great vacation!