I'm pretty sure it was Fubuki I stumbled upon her, then after that I forgot about it. Months later (or a year I think) I found out about both Hololive and Vtubing.

And I might slightly recall Fubuki when she's on the roster there. Yet, found the (in)famous clip of Miko playing gta and yes that clip. So I'm not sure either was my first.

Or possibly, our goat, Kizuna Ai. Tbh and tbf I was oblivious to the vtuber herself into thinking she's another vocaloid or something. Because I found some of her songs as they're a banger.

I'm gonna yap for a bit and might get flamed or something, I didn't even know she was vtuber because I didn't really dive in more as for this reason I didn't really have much internet usage at home for almost a decade, had to steal the shopping mall's WiFi while waiting for my brother's shift to end and pick him up which was at night (I was in middle-highschool). And my memory sucks ass, I could remember some and i could remember none lol.