You already record long-form video. Use Klap. Repurposing a library you own into captioned, reframed verticals is the best return in short-form, and no generator competes with real material.
You have no footage and want scheduled volume. Use Revid. It generates the video and can post it on a schedule without you opening the app, which is precisely the product it sells.
You want an original cast that returns every episode. Neither: both are built around one-off clips rather than returning characters. That is where an episode pipeline like Frutti fits, with written dialogue, distinct voices and a cast that comes back, at the cost of being paid and slower than a template.