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Zed O'Brien (ツェッド・オブライエン)A stern merman with similar powers to Zapp, as they were both taught by the same master. Joins Libra after being abandoned in Hellsalem's Lot. A stark contrast to Zapp, Zed is a decidedly serious individual who has little patience for nonsense, particularly those of his fellow disciple.
(Source: Kekkai Sensen Wikia)