What are some good classes from previous titles that would have been cool in 3 Houses? Which would work as good unique classes for the students?

In general Ninjas and Witches from Fates would be dope. Imagine Lysethia as a witch with warp for herself AND her team mates.

For a unique class I would have loved Tank as an option for Leonie and Songstress with Dorothea, make her like Azura but bettter