Quote 16
Bryce Lynch no longer existed. I was Wade Watts again. (31.29)
Wade doesn't just create an online identify for himself; he creates a separate real-life alias to evade IOI's surveillance.
Quote 17
Even though I now knew Aech was actually a female in real life, her avatar was still male, so I decided to continue to refer to him as such. (34.17)
For Wade, Aech's online identity still holds priority over her true identity. Since Wade's no longer compulsively obsessed with the OASIS at the end of the novel, maybe he can look beyond the avatar and see Aech for who she really is.
Quote 18
My avatar had a slightly smaller nose than me, and he was taller. And thinner. And more muscular. And he didn't have any teenage acne. (2.5)
These seem like minor changes to Wade, and maybe they are in a world full of Vulcans and cat people, but it still shows how the OASIS is a world where you can create your own appearance how you want it. Who needs Botox when you never leave your house?