Slight grammar correction here (if you’d prefer me not to do this in the future let me know, because I might be wrong too!), in this sentences you would want to use 「しかvtuber見ません」because しか requires a negative – BESIDES 戌神ころね, I don’t watch vtubers. I guess if you wanted to flip that you could say 「vtuberは、戌神ころねだけ見ます」(When it comes to vtubers, I only watch Inugami Korone), but I don’t have as firm a grasp on how to appropriately use だけ。