A character drawn with sufficient complexity to be able to surprise the reader without losing credibility; a developed (and developing) character.

It seems like you're asking about a well-rounded or dynamic character in literature. Here's a step-by-step explanation:

1. Introduction: A well-rounded or dynamic character is a character in a story or play who undergoes an important, internal change because of the action in the plot. They are complex and increase in complexity throughout the story.

2. Description: These characters are usually more realistic and relatable because they have a multi-dimensional personality. They have strengths, weaknesses, and a full range of emotions.

3. Development: The development of such a character is usually a gradual process. It happens as the character faces different situations and challenges. Their reactions to these situations give the reader new insights into their personality.

4. Surprise Element: A well-rounded character is capable of surprising the reader. This is because they are not predictable or one-dimensional. Their actions and decisions are influenced by their complex personality and can therefore vary depending on the situation.

5. Credibility: Despite their complexity and the surprise element, a well-rounded character does not lose credibility. Their actions and decisions, while sometimes surprising, are always in line with their developed personality. This makes them believable and relatable to the reader.

6. Conclusion: In conclusion, a well-rounded or dynamic character is a complex and believable character who undergoes development throughout the story and is capable of surprising the reader.