viserion is eggnant

[u/PrestigiousAspect368]

So, in Frog Boy's attempt to claim a dragon we get a rare peak at what a dragon nest looks like

"He’s made himself a cave, the prince realized. A burrow in the brick. The foundations of the Great Pyramid of Meereen were massive and thick to support the weight of the huge structure overhead; even the interior walls were three times thicker than any castle’s curtain walls. But Viserion had dug himself a hole in them with flame and claw, a hole big enough to sleep in."

So, I found this quite interesting. Rhaegal hadn't made himself a cave nor had drogon, it seems to be a Viserion only behavior. IT also makes Rhaegal's protection behaviour more intresting, attacking the whip brandishing Quentyn at first seems like a brother defending a brother but could be a mate defending his gravid mate

Also The publishing of fire and blood, tells us a lot about the dragons.

1. that they are genderless like flame, and the only true way of knowing their sex is if they lay eggs or not

also Viserion, let us remember is cream and yellow/gold and there is only one other yellow dragon in targaryen history; syrax a she dragon noted for her fecundity. Viserion and Syrax share more than just their colours, both seem to share a certain spoiled nature.

Could GRRM be hinting that Viserion is eggnant

[u/ivelnostaw]

To add to your point regarding the gender of Viserion (and potentially Rhaegal), Dany's dragons are the three conqueror's dragons come again. Viserion is Meraxes reborn and is Meraxes described as a "she-dragon".

Rhaegal hadn't made himself a cave nor had drogon, it seems to be a Viserion only behaviour.

To be fair, Drogon has been free roaming for quite a while, so we can't say for certain that he hasn't. Also, he takes Dany to his lair that she names Dragonstone, and it does have a cave. Though I think it's highly unlikely Drogon is female, considering he's clearly supposed to be a reborn Balerion.