What is fire emblem fates marriage planner?

Fire Emblem Fates Marriage Planner is a fan-made tool that allows players to plan out the marriages and children for their characters in the game Fire Emblem Fates. The planner not only calculates the stats and abilities of the resulting child but also determines which hair color and appearance they inherit from their parents. The tool also has a comprehensive list of all characters, their castles, and their skills, making it easier for players to determine which characters to match. The planner is especially useful for players who want to optimize their gameplay by using the best characters and skills available in the game.