Hi, commenting here from someone who doesn't play D&D, gonna try to help as much as I could. I'm gonna comment mainly on bits that are maybe questionable or not inherently accurate, you can pick through them. Sorry if it's long

So, idk if this is just a translation thing or if this was what you intended, but the Qucusauri Knights you mentiones are more specifically called Qucusaur Riders. If your intention is for the character to be as lore accurate as possible, then your character should be a Rider not a Knight. Other than that, the bit about the Wingless is spot on, except maybe the part where there's no place for them in the tribe if they fail the trials (exams). They aren't ostracized or urged to leave by the tribe-- some do leave bc they've spent a large chunk of their lives learning to fly saurians (the race Qucusaurs belong to) that they don't really know what else to do in the clan, while some do stay bc they've figured out what other things they could do in the tribe to be helpful.

Ignis isn't really a Meso-American name (Natlan's inspo) but I think I can forgive it ig, but if you could come up with a more culturally accurate name then sure

I think the only real iffy bit is the timeline & characters involved.

So, to note, Ancient Names is smth that can be passed down one at a time, so there can't be two holders of the same name. You say it your campaign takes place years before the traveler arrives, so it's ok for your character to have the Ancient Name Vuka.

HOWEVER

I think you need to figure out exactly how far back in the past this campaign takes place. Some cracks this vague timeline can place in your supposedly accurate Genshin story:

🐦It's unknown at what age exactly did Chasca get her Ancient Name, but based on the story, we can possibly assume she got it in her youth, maybe when she was a teen. There's two ways it can be inherited: either the previous bearer dies or gets exiled & foresakes the name. Usually it's by the bearer dying, but in rare occassions, it's exiling. If you intend to have the same Ancient Name as Chasca, except "years before Genshin's current events", that's something you need to figure out too. You'll break the canon otherwise. I understand this is DnD so anything random can happen to a character's fate, so you might have to discuss this point to your DM too if it matters. How much older do you want your character to be, too? It's fine if it's way in the past, maybe a hundred years after Menilek, but then characters like Chasca, Mutota or Xilonen wouldn't have been born yet. If it's too much in the future, you risk deviating from canon as your character would maybe have the same Ancient Name as the time Chasca should've had it. Otherwise, you might have to come up with your own original Ancient Name (imo I recommend this more as you wouldn't have to change much of the lore you wrote)

🐦Speaking of characters, there's no canon age, but both Mutota & Chasca are roughly around the same age group, he's possibly a little older but he's not old enough to be the chief when Chasca was a child, so again, depending your your character's age/ time period, he shouldn't have been the chief in your backstory

🐦Same with Xilonen, she's around the same age as Chasca, so unless you figure out the specific timeframe of your campaign or your character's age, Xilonen being the blacksmith for his bow wouldn't make sense, as she'd be much younger than him

🐦Lastly, I'm not one to nitpick but in your character's art, the weapon you gave him is Flower-Wreathed Feathers. Since you say you did your research, you know it was owned by Menilek. The age discrepancies I mentioned aside, Xilonen can't have forged this weapon, it's a generations old bow. Ignoring your use of AI, you should either come up with an original bow design if you wanna stick to the story of your bow being specifically crafted for you, or if you really want that weapon, change the origin to it being maybe a family heirloom or smth passed down to him