Luffy (One Piece) - Not entirely sure though.
Theres a possibility he cant.
Sebastian Michaelis (Black Butler) -
This one i AM sure, wierd since its a shoujo anime. But unless you're
a Grimm Reaper, then its actually impossible to defeat this guy. Thats
just how the author made him, simple as that.
Goku >>> Luffy
At most, Goku's punches can't hurt luffy, but he has lots of ways to hurt Luffy. Luffy won't even be able to keep up with Goku's speed.
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Goku, as all other Saiyans, is very strong but limited in power. The only way for Goku to literally destroy a planet is with a spirit bomb because all his other attacks rely on his own power. Without the power of others Goku can never achieve the power necessary to destroy a planet.
sooo... u know u kinda need that power of friendship so sebastion probably can beat him and gojou from jjk
a spirit bomb is not at all the only way for goku to blow up a planet. Vegeta was able to blow up a planet by himself before he made his way to earth. and obviously both goku and vegeta are leagues and leagues above that now. They could break a planet with a punch if they wanted to, a spirit bomb is not the only way. In fact im pretty sure a spirit bomb cant blow up a planet just cause of the way it works