The Figure Library is a collection of character models that are preplanned for future display. Think of them as being prototypes for an exclusive "behind the scenes" feature.
Character templates are sheets of a single character who is posed in different actions.
Similar to how a sprite sheet in video games may list individual sprites (character poses) of the actor in the game, the name "Figure Sheet" is to imply individual figures in animations.
Before deciding on a character's design, they are tested wearing different outfits.
Assets are individual pieces of a character to reuse in various artworks. An asset could be clothing, body parts, or even props