I was asked the other say if regular people could see Hydelean and I asked the person of they meant in the Aetherial Sea or outside of it. They then asked both. Which I said maybe inside the sea, but I wasn't sure about outside of it. And when I mean inside the sea I mean if some random person gained access to the sea and wasn't accompanied by an echo user, or an ascian.

I couldn't think of any time she appeared either as Hydelean or in her Venat form outside of the sea where only an echo user saw her. We also don't know if she showed herself more often in the earlier ages. Obviously if you're dead and are waiting for your soul to be cleansed you could probably see her.