1) pikachu, everybody on the planet knows it. also lots more pokemon are on the n1 spot after pikachu.
2) goku, obvious reasons. Everybody knows him, probably less people that pikachu as parents most likely also know it by now, also the side cast is very well known such as vegeta / freeza .
3) Less people know him, but still very very well known in the market and tracks behind goku for sure, i don't think much of the other cast is known well however.
4) With the insane amounts of episodes and never ending anime, i am sure he's well known by now by most people, but still i would say below the other 3 and more nich to japan.
5) one punch man, got insanely populare in the western market, because its unique on how it does everything different, also resembles kind of a bootleg superman in a modern interesting take.
6) Bleach, and when talked about bleach the main character in the series is probably aizen as the main character is kinda forgettable and this guy takes the headspot on that front.
still far more nich then the other anime's.