Cast offsite — this one got away.
Spike based on the My Little Pony: Friendship is Magic TV series. This story takes place during season 8. The season acts as a backdrop or is notably changed throughout the chapters. This particular arc takes place before Spike gets his wings in season 8.
Spike takes the news of Rainbow Dash's transformation easily and even tries to convince the ponies who eventually become mevs that the matter is not a big deal. He thinks the fact that Rainbow is a master mev can easily be revealed if asked about. He only grows apprehensive when Rainbow Dash is about to eat Twilight's magic with Twilight's knowledge and permission. Rainbow asks for him and Starlight to leave the room since it's her first time. For the audition lines here, he is not apprehensive at all. He uses the Fledgling Hunt games as a chance to act as a commentator like how he once did for Rainbow Dash and Applejack's Iron Pony competition in the episode Fall Weather Friends.
Chapter Appearances with dialogue:
Chapter 03 - The First Meal
Chapter 04 - Waiting to Start the Pack
Chapter 06 - Blitz
Chapter 08 - The First Fledgling
Chapter 10 - More Fledglings
Sample Dialogue from the actual My Little Pony: Friendship is Magic TV show: https://www.youtube.com/watch?v=muVpG0FKiJI
There is an audition example from me on this role to give actors an idea of what I have in mind.