I am not a legal expert, but I can provide some general information regarding copyright and potential infringement. Copyright laws vary by country, so it's important to consult the specific laws in your jurisdiction or seek legal advice for a precise answer.
Copyright protects original works of authorship, such as art, music, literature, and software. In the case of Plants vs. Zombies (PVZ), the designs and characters, including the classic zombie design, are likely protected by copyright owned by the game's developer or publisher.
If someone uses copyrighted material without permission from the copyright owner, it could potentially be considered copyright infringement. However, there are certain circumstances where the use of copyrighted material may be allowed under the principles of fair use or other applicable exceptions.
Whether the use of the PVZ-inspired avatar by a virtual streamer constitutes copyright infringement depends on several factors, including the specific details of the use, the jurisdiction in which it occurs, and whether any permissions or licenses have been obtained from the copyright owner.
If you believe that someone's use of copyrighted material constitutes infringement, you may want to consult with a legal professional who specializes in copyright law. They can assess the specific situation and provide guidance on the best course of action.
Please note that the information provided here is not legal advice. It is always recommended to consult with a qualified legal professional to obtain accurate and tailored advice regarding copyright matters.