Here's some of my all time favourite fanfics:

• https://archiveofourown.org/series/1239998 (A crack fic about time travelling tiny child Izuku destroying AFO with the power of kitchen implements.)
• https://archiveofourown.org/series/968343 (Badass tiny Hermione worshipping Loki, Norse mythology style.)
• https://archiveofourown.org/works/22365040 (Dimension travelling, grumpy, Hufflepuff Ed Elric.)