I could go either the computer speakers route (they'd have to be top of the line in that category) or the traditional route with an external amplifier and passive (or active) real speakers. I am much more likely to go the latter route, as that is what I've always done before.
I have no size limit on the speakers themselves, however room acoustics and size does dictate what kind of speakers make sense. This area is not particularly large, so small speakers make the most sense. This is not commonly known, but certain kinds of speakers no matter how much they cost are more suited to large rooms or concert halls. For most medium and small rooms, really the best speakers you want are small or medium-sized, with the same kind of form factor as what Necromusume posted. You can still spend anywhere from $100 to $10000 for such speakers, but the top end is more about bragging rights and riches, and I'm not seriously intending to go there at this time, as I'm not currently a follower of such circles.
I want those dirt cheap Magnapans, but they won't sound at their best in this house. As for the Alesis that Necromusume posted, I skimmed the article and thought "magnetic shielding wha?!" then I saw the article is from 2006. Your speakers are quite old, the same as most of mine. (People don't use magnetic shielding anymore because they only affected CRT televisions).
As for their quality, without listening to them I can guess that they probably sound like an average or low-medium quality real speaker (amplifier plus passive speakers) setup. I can read what the drivers are made of and the crossover frequencies design and freq response range and sort of guess.
Speaker technology actually hasn't fundamentally improved in over 30 years. People are still doing the same things, with age old ideas. A few new ideas and materials mix in but they don't revolutionize anything. I feel there is one particular thing people are failing to understanding regarding speaker design, so no one ever made the exact proper speaker I wanted.
I have a couple of audiophile brands I have my eye on, but I don't really want to pay their asking price of $2,000 ~ $4,000 a set, so I need to bargain hunt for used. Except I don't know where the secret audiophile sites are these days, I only know that Ebay is limiting what you see to 15% of what's out there.
Larger woofers are not necessarily any better than small. Given what I know about speaker design, I could go with either 5" or 6.5" woofers, but I don't want to go bigger. I want slim speakers, because the most important aspect of this room is the vtubering, and big speakers will get in the way of the TVs. My computer itself is already getting in the way (I don't want to put it on the ground because this room has carpet) and may take up a TV slot.
I don't know how streaming and vtubering works yet, so I do not know how many TVs that I will need. However I am expecting to need around 3 large screen TVs, and I am leaving open the possibility to use 10 large TVs and make like a 360 degree studio. For god knows what. There is also a big ass piano in this relatively small room that I have to work around.
QUOTE(Ass Spanker)

Shamefully admitted, I have been listening to a fair bit of vtuber (original) music recently. I deem it a necessary evil to gain access to my favorite composers/producers.
I looked into that video a bit more and it seems this is a test run for their real performance live in Japan at the Tokyo Game Show this weekend. The lead girl does appear to be a professional idol dancer or whatever, and already rehearsed enough. (The other girl said she was doing this for the first time). She is all funny and glitchy in that video but it's her apartment setup causing it: she will presumably not be glitchy in Japan.
I thought you might recognize their song, but maybe not. Maybe it's a vtuber original song? It sounds good though so I thought maybe it was a doujin, rhythm game, or popular idol song or something. I predict this vtubering stuff will catch on and grow exponentially, so you are doing the right thing. It shall eventually become the way of things.