What are the duties for a video game designer

It is a little vague to answer as to what one designer does from one game to another, or in general. A VG designer, often are broken up into many parts and sometimes not. Depending on the budget a designer might create the character models, their actions and their results. In a different game the designer might design character models and leave the project. In another, the designer might end up designing characters, backgrounds, even entire worlds imagined simply because they wanted it and you can.