Hatsune Miku? May not be the same thing your kiddo is in to, but boy is my very gay nephew obsessed. It is entirely adorable. I even added "CV01" to the ssid of the WiFi because I am the cool aunt.
If it helps give context, Miku is more of a mascot for a text-to-voice project/software that can be used to program singing using her voice or other voices too. I think all the voices have mascots that they call vocaloids.
The videos are probably promoting songs where her voice is used.
That's true. I guess you have to kind of consider it in the context of the style? Anime leaves out a lot of detail in the face, and changes proportions around, so you have to have that cipher in your head that accounts for that, maybe?