Final answer:
Without context, it is not possible to determine if Sven is big and fat or small and wiry, as this question likely refers to a character whose description depends on the context provided in a work of literature or scenario.
Step-by-step explanation:
The question regarding whether Sven is big and fat or small and wiry does not provide enough context or information about who Sven is to give a definitive answer. It is possible that this question refers to a character in a book, a historical figure, or even a hypothetical person for an exercise. Without additional context, such as the title of the work or the situation in which Sven is mentioned, it is not possible to accurately describe his physical characteristics. In English studies, when discussing characters from a literary piece, it is important to base descriptions on textual evidence or authorial descriptions provided within the work itself.