Not only is Pekora effortlessly funny and charismatic, but she is also probably the most self-aware vtuber out there. Other chuubas overextend themselves and try to take on roles that they aren't suited for, whether that be hardcore gaming, GFE, or (most commonly) coomerbaiting. Pekora is highly intelligent and knows exactly what her strengths and weaknesses are, and never places herself in a scenario where she doesn't look great. Combine that with the fact that she never really had many weaknesses to begin with and it makes sense that she'd be the most popular vtuber.