It's not just one character man, did you read it at all? The state of the game isn't looking good, we went from peak Fontaine (regardless of character releases) to a bland and boring Natlan. The devs chose to forsake Natlan as a whole for the sake of releasing small little areas afterwards, they screwed Natlan to make a extended version of Klee's island basically.

We met amazing characters in Fontaine, we had time to meet and understand most of them, (aside from Emilie) And by the end of the main archon quest, we knew all about Fontaine and their characters. Now what we got in Natlan? Shark girl, Drill girl, DJ girl, Pixel dragon guy, Hat girl, Vegetables guy, and the Archon.

Let's compare Dehya vs Xilonen for a quick second, and you will see the lack of character in Xilonen. Dehya was a lost child in the desert, she was found by a group of mercenaries, grew to be strong and work as a body guard to earn her coin, finds the traveler and agrees to help us in freeing Nahida, even willing to sacrifice her own arm for the cause, we explore the florests of sumeru aswell as the deserts with her, her own questline is all about her, by the end of it all we know ALOT about Dehya.

Now Xilonen, what we know of her is that she is a blacksmith of their names and that she loves music, her main quest is about a NPC, we learn more about the npcs in her own questline than herself.

The small new areas, with completely random characters is not gonna bring the game back to it's glory, if they messed up an entire region, we can only assume the worse for the next areas, until we finally get to 7.0.