Dodie Clark as Isadora Talia Potter

James and Oliver Phelps as Fred Gideon and George Fabian Weasley

Anne Hathaway as Professor Andromeda Tonks, Transfiguration Professor and Head of Gryffindor

David Thewlis as Professor Remus John Lupin, D.A.D Professor

Gary Oldman as Lord Sirius Orion Black. Professor for Financial Management and Politics, and Co-Professor for D.A.D.A during the Full Moons (if not teaching his lessons).

New Professors:

Helen McCrory as Lady Narcissa Druella Malfoy. Professor of Wizarding Traditions and Etiquette.

Alexander Vlahos as Lord Theodore Nott Sr. Professor for History of Magic.

Tom Hopper as Professor John MacMahon for Forgotten Arts.

Angelina Jolie as Lady Drusilla Greengrass. Professor for Magical Languages and International Relations.

Lauren Ridloff as Lady Melissa Zabini. Professor for Healing.

Emma Roberts as Lady Louisa Spinnett. Professor for Spell Crafting.

Brian Tyree Henry as Lord Jeremiah Johnson. Co-Professor for Curse Breaking and Ward Design with Bill Weasley.

Colin Morgan as Lord Damon Greengrass. Professor for Ancient Magicks.

Niclas Gillis as Lord Steven Goldstein. Professor for Wizarding Laws.

Poppy Drayton as Lady Mary Abbott. Professor for Introduction to the Wizarding World.

Robbie Coltrane as Professor Rubeus Hagrid for Care of Magical Creatures. (He took the qualifications over the summer and his lessons are structured).

Other:

Alicia Vikander as Mind Healer Felicia Fawley. Izzy's Healer.

Michelle Gomez as Ginny's Mind Healer. Mind Healer Suzanna Cutkoskey.