There are many different ways to develop a character. Some writers will develop their characters as they’re writing, using the plot to help flesh out the characters in their minds. This plot-driven character development methodology is also a valid method. Never let anyone try to convince you otherwise. However, ALL actions for a character in that final draft need to make sense. If a character is behaving oddly, i.e. not as a reader would expect, there better be a good reason for it, and those reasons do need to be revealed to the reader.
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