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Fumiki Hatori (羽鳥史輝 Hatori Fumiki): is the son of Yuuki and Chika, being the little brother to Chise.
Skills and Abilities
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.
↑Mahou Tsukai no Tsukai Manga — Vol. 9 Chapter 42,
The name of each family member is revealed.