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Consider having a PNG available. If you have technical difficulties you might notice that access to functioning non-PNG model is not always available. I have seen this situation with ARK survival Evolved, and even GTA 5 where vtubers have the ability to run a game, but not run a game, and have a functioning non-png model at the same time while they are streaming. By having a PNG model handy you can skip any drama of wanting to be a vtuber and play the game you downloaded at the same time. There are a wide array of ways you can decide to run a PNG with something as simple as a series of two different positions as you push to talk to perhaps even having some positions you can toggle. I have seen streams where even a static PNG with no other positions was accepted so really I guess it doesn't matter too much as long as your PNG is definitely recognizabile as your vtuber avatar. I have even seen situations where a PNG avatar was used to represent a vtuber where the association was not clear, but the vtuber used oral communication to make it clear that he was using a ai generated avatar as his model for that stream.
I have seen in my time a vast array of PNG models used. Some PNG models (the more static ones) are used in relaxed positions, or resting positions while other PNG models that have more toggle, or positions have been made at a attentive position. I myself have managed to be a vtuber once by PNG. I was invited to a show where the host had a PNG models ready for me. I guess I should mention that too. If you have any fantasy of collabing with someone it could be of great benefit to have a PNG model of them available to you on the random off chance that such a collab happens on short notice without much time to prepare, or make arrangements. You never know when someone might be available to collab with you out of the blue, and often times that's how collabs happen as the lives of most streamers can be difficult to predict, and very difficult to make planned arrangements with when it comes to collabs, and things of that nature when it comes to streaming. Recently you may have noticed that in even holo live surprise collabs have been trending if that tells you anything about the nature of streaming, so have that spare PNG handy in case that moment comes that you might have a desire to use it in a effective way that makes things easier for you, and your ever attentive loyal audience.
I guess I should also mention that having some png items, or assets of things you may want to post, or paste on your stream could be of benefit as well. There's a vtuber you may be familiar with if you frequent this thread who goes by Haru. During his holiday stream Haru had a holiday festive tail which he decorated as a tree would be decorated during the more festive time of the year. Haru if I remember correctly decorated his festive tail with an assortment of PNG images he could clip to the tail which was swaying thanks to his rigging. It was quite a spectacle. I'm not saying you have to copy Haru exactly, but if there was something you wanted to bring to the attention of your audience in a clear yet playful way having a PNG available to express that would be good should that moment ever come to you while you are live streaming.