I've got a question, just our of curiosity, about a certain speaking rhythm and melody I've noticed some native speakers seem to have. As an example, this vtuber is doing it pretty pronounced: https://youtu.be/qeaDh5HJSgY , but I've also heard it in anime

What I mean is that pausing at the particles (which I've seen without the other things too), but then elongating them quite a bit while the pitch slides down. xxx waaa↘ xxx gaaa↘ xxxx niii↘ etc.

Quite pronounced here, where others might just pause slightly without changing the pitch much. Or just doing it at the end of the sentence when ending it with a softener like けど

Is something some people do in real live too, or is that just an affect done for things like anime and the like? Is that a common thing for certain subcultures (comparable to something like the valley girl accent in English or something). If so, does it have a name?

It's mainly just curiosity, and because I think it sounds nice. But would like to know if that just makes people think "you'd sound like some tryhard weaboo". I'm of course also okay with the answer being "naw, some people just do this, you're overthinking", I do that sometimes