Innate Magical Power - As with the rest of his family, Fumiki has incredible magical energy that in the same vein as his father created a protective barrier around the Hatori family apartment keeping the neighbors of Japan away.
The name Fumiki means "history" (史) (fumi) and "brightness" (輝) (ki).
Fumiki's surname Hatori means "wing of a bird" (羽鳥).
↑Mahou Tsukai no Tsukai Manga — Vol. 9 Chapter 42,
The name of each family member is revealed.