The Straw Hat Grand Fleet is a fleet formed by seven organizations who vowed to serve under Monkey D. Luffy and the Straw Hat Pirates.
In SBS Volume 82, Oda drew the Grand Fleet representatives as children.
D: Oda-sensei, please draw the Straw Hat Grand Fleet captains’ appearances from when they were children! I beg of you! P.N. Thank You Pirates
Oda: Here you go.