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Remember to buy merch. Vtubers would not have merch available for purchase if they didn't want you to buy merch. Even banned viewers can buy merch.
Vtuber merch, and the wearing of said merch is one of the few ways to recognize a fellow viewer of said vtuber. Unless you are a vtuber meeting another vtuber nobody will know you're a vtuber viewer without the wearing of merch.
That said I can understand not wanting to wear merch. If you paid over $5 for a merch T-shirt I can very much understand wanting to keep it safe on a wall as a tapestry.
If it's a cheap 5¢ keychain though it would make a great traveling companion. Even if you were a banned viewer.
If you cannot afford merch try making some for personal use.