Glad I'm not the only one this has happened to lol Not in this particular book. But in the one I originally was going to write for NaNoWriMo, my Antagonist insisted on being in the spotlight. He was so strong I realized he'd have to have his OWN Novel/Novella altogether just so I could focus on my plot line!! Had to put that one on the back burner as a later project lol

Looks like it hasn't deterred you though, working Day 19 with a MC change?! Impressive! Sounds like you have the ins and outs of your book down pretty well! It's wonderful to see how other writer's process and move along.

Darleen
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“The scariest moment is always just before you start.”
― Stephen King, On Writing