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Round characters are complex with depth and development, while flat characters are simple and serve minor roles. Round characters evolve and have multifaceted personalities; flat ones are often static. Examples: Daenerys Targaryen, Severus Snape, and The Grinch are round; Ginny Weasley and Spicer Lovejoy are flat. Tips for writing: Round characters require detailed backstories and clear motivations, while flat ones need defined purposes without excessive detail. Balance both types for compelling storytelling.
https://www.literatureandlatte.com/blog/what-is-a-round-character-in-literature