Fred, Scrooge's nephew, is introduced early in the novella and is described to be "ruddy and handsome". This comes after the description of Scrooge's "thin lips" and "old features", causing the reader to instantly warm to the fresh and youthful atmosphere that Fred introduces.
Dickens builds on this by informing the reader that Fred's eyes "sparkled", presenting him as cheerful and excited. This is reinforced by the fact that he arrived "all in a glow", an interesting description as it is associated with the motif (repeated idea) of light within the novella. When Dickens uses descriptions of light, as seen here and with the "jet of light" emitted by the Ghost of Christmas Past, he is often symbolising innocence and goodness. This reflects onto Fred's character, causing the reader to understand that he embodies these traits. In doing so, he presents him as an exemplary character whom readers should look up to.