Defintions of Prototypes not found. Models and prototypes are semantically related. You can use "Models" instead a noun "Prototypes". popular alternative
Worker models were rarely seen in the original series (which had only a few episodes, and focused on the combat models and prototypes), but they turned up frequently in the TV-series re-imagining, Bubblegum Crisis 2040.
And it was also averted in Mazinkaiser: Shin Great Mazinger and Mazinkaiser are explicitly stated to be the finished models, their predecessors are the prototypes.
In Project Ignition, there's the TYPE-Sione new model NEXT, which is obscenely powerful... The three stolen TYPE-Siones are actually production models, not prototypes.