Elliot Page Vanya Actor Tom Hopper Luther Actor David Castañeda Diego Actor Emmy Raver-Lampman Allison Actor Robert Sheehan Klaus Actor Aidan Gallagher Number Five Actor Justin H. Min Ben Hargreeves Actor Colm Feore Sir Reginald Hargreeves Actor Kate Walsh The Handler Actor Cameron Britton Hazel Actor Adam Godley Pogo Voice Ritu Arya Lila Pitts Actor Yusuf Gatewood Raymond Chestnut Actor Marin Ireland Sissy Actor Steve Blackman Executive Producer Jeff King Executive Producer Keith Goldberg Executive Producer Mike Richardson Executive Producer Gerard Way Writer, Executive Producer