>>28518574As much I love other protagonists, I still don't think the lack of their appearance is enough reason to hate Generations.
Using Red is a safe move. He and Ethan are the only confirmed to be male protagonists, since being a female wasn't an option back then. Red is also the most popular one.
If they have Hilbert appear as BW protagonist, they will be basically announcing that he was the canon protagonist. If they have both Hilbert and Hilda appear as BW protagonists, they're going against the game canon. That's bad, since their goal is to animate scenes from the games, not to make something based on the games.
In the end, using Red is the safest move for them. As much as I would like others to appear, from GF's standpoint, it's a bit hard to make that happen.