Try and talk you way out of this lore team challenge!

[LineageRazor]

Only those of Ishgardian origin can become dragons after drinking of dragon blood (and a specifically prepared dragon blood, mind you), because only them descended from one of the Knights Twelve (they gained this ability, and thus all their descendents, because they gouged on Ratatoskr's eyes). Given that our character is not an Ishgardian, we don't have the ability of transforming, even when drinking dragon blood, so I believe it's quite safe (although heretic) to do so.

Now here's something interesting. Just how long did Nidhogg wait to get his revenge on the knights and King Thordan? We know that there were only four survivors from among the Knights Twelve, and presumably only offspring produced AFTER consuming Ratotskr's eyes would be imbued with dragon essence, right?

So, either all the Ishgardians are descendents of those four knights, or Nidhogg gave the King and the Twelve plenty of time to pump out some kids before going medieval on them...

[Koujiro]

Now here's something interesting. Just how long did Nidhogg wait to get his revenge on the knights and King Thordan? We know that there were only four survivors from among the Knights Twelve, and presumably only offspring produced AFTER consuming Ratotskr's eyes would be imbued with dragon essence, right?

So, either all the Ishgardians are descendents of those four knights, or Nidhogg gave the King and the Twelve plenty of time to pump out some kids before going medieval on them...

The thing about Nidhogg is that he doesn't want to avenge Ratatotskr (at least not any more). He wants to make all Ishgardians suffer. Not only because they are all descendent from the Knights Twelve, but also because he doesn't trust - and even hates - humans any more (remember, the Elezen were the ones that broke the trust with the Dragons by foolishly listening to the Ascians and killing Ratatotskr for her eyes). And he's doing so for the whole duration of the Dragonsong War (a thousand years or so). That's why he never tried to finish the war. He simply tries to make them suffer as much as possible, for as long as possible. So he never "waited" to get revenge. The Dragonsong War itself is his revenge.

[Enkidoh]

Now here's something interesting. Just how long did Nidhogg wait to get his revenge on the knights and King Thordan? We know that there were only four survivors from among the Knights Twelve, and presumably only offspring produced AFTER consuming Ratotskr's eyes would be imbued with dragon essence, right?

So, either all the Ishgardians are descendents of those four knights, or Nidhogg gave the King and the Twelve plenty of time to pump out some kids before going medieval on them...

That was indeed the case and infact was more the reason why Ishgard has started tearing itself apart following the revelation of the origins of the Dragonsong War - as Ishgard's theoracy had made up that only those of 'noble blood' were descended from Thordan and the Knights Twelve, where in actual fact, every Ishgardian, either noble or low born, traces their ancestry from those six remaining knights (remember, there was actual six surviving knights not four as shown in that Echo scene, when the survivors decided to "leave the throne empty" and establish themselves as stewards, two decided to cast away the sword and settle down into "honest trades", one of whom strongly hinted to have been the founder of the 'Forgotten Knight' pub in Ishgard based on his "serving ale instead of steel" remark - hence the pub's name rings true. The other one, it's unclear where he went or what he did, he had no dialogue and wasn't even named in that Echo scene. So those two nameless knights presumably were the ones who established the 'lower ranks', the common citizenry who eventually became downtrodden as the 'lowborn'. The remaining four knights were the founding members of the Four Noble Houses of Ishgard and established the city's nobility, eventually intermarrying so much that the actual family lines are probably now very blurred indeed.

Thus this alone probably caused more anger and resentment among Ishgard's citizens than the revelation that elezen and dragon once lived together in harmony or that it was Ishgard who betrayed the dragons and caused the Dragonsong War, which is sadly also partially the reason why Aymeric's reforms to restore relations with the benign dragons of Anyx Trine are constantly meeting with resistance from his own people - because it was the nobility who lied to them, it's ironically caused a situation where to many in the Foundation no matter what a noble says now it's bound to be a lie, and thus reacts accordingly. It's a sad situation to be true, but something which can be overcome. Alas, with Nidhogg's shadow continuing to darken the skies it will be a long time yet before Ishgard and dragonkind finally sees peace.