The characteristics of KFC's early advertisements can be summarized as follows:

1. Emphasis on unique food taste and formula: KFC's advertisements emphasize its secret fried chicken and special formula, highlighting its differences from other fast food brands.

2. Emphasize family and reunion: KFC's advertisements often show scenes of family, children and friends, conveying the feelings of family reunion and enjoying delicious food.

3. Attract the audience through the storyline: Early KFC advertisements often used interesting storylines to arouse the audience's interest.

4. Emphasize the iconic appearance of KFC: KFC's advertisements show its iconic red and white appearance, making its brand image more vivid and easy to identify in the hearts of the audience.

It should be noted that the specific details will vary according to the advertising characteristics of KFC in the early days. The above is a general summary, and the specific situation may change.