I guess Ari would be extremely unusual by Atlantean standards then, being a black haired telepath in human form. If it's a hard and fast rule for the humanoid denizens of Atlantis, I could go with my original idea of her having golden hair then incorporate gold somewhere in the seal. If not, it'd be one more way she could surprise people who only look at her surface appearance.
The 'curse of blonde hair' came from Kordax, a villain and ancestor of Aquaman. The Curse of Kordax is why Aquaman was supposedly abandoned as an infant (post- Crisis on Infinite Earths). In this version of Aquaman's origin his mother, Atlanna, has red hair and not listed as having telepathic abilities.
The more current (Rebirth) version of Aquaman mentions nothing of the curse nor Kordax. Atlanna now also has blonde hair and the ability to control sea creatures telepathically. Her son and Aquaman's half-brother, Ocean Master, also has this ability yet has black hair.
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