If Zoras can become Rito, I'm sure they can interbreed to produce human children as well.
Also, as a side note, the Maidens of FSA were able to change shape, so its possible that at some point along the line the multi-raced Sages took on human shapes.
except that the Zoras of ALttP are completely different then those of TP.
The green zoras are shown to exist in PH. Nothing says that every Zora became a Rito, and this seems to confirm that there was another offshoot (if not an entirely separate species).
"Refuting 3: Where Do Babies Come From?
How do you get seven apparently human descendants from a group of five more-or-less-humans, a rock-man, and a fish-woman? Frankly, I don’t think anybody knows. Does that make the idea any less plausible in a fantasy setting? Absolutely not!
The Zelda...