Top 10 The Grim Adventures of Billy & Mandy Fan Theories

The Top Ten
1 Billy had ADHD while Mandy had autism
2 Claire and Phil had a brown-haired daughter and a blonde-haired son
3 Aunt Sis' real name was Aunt Pearl
4 Billy's last name was Atoms, Mandy's last name was Maxwell, and Irwin's last name was LaMarr
5 Irwin had glasses at age 4
6 Billy had an older sister with black hair
7 Endsville Middle School existed
8 Nigel Planter hit puberty when he was 13
9 Melvin is secretly a dhampir and half-vampire
10 Phil is half-warlock

His descendants and ancestors were once hanged, burnt to a stake, decapitated and executed for using magic, so they were killed.

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