Luffy is characterized by his carefree appearance as a tireless fighter, while Toriyama draws Goku as a affable boy and with a crazy passion for fighting. So, these two characters are more alike than you might think, happening because the two they are real food eaters.
Below you can see how this is completely true in the fan art dedicated to them. pukiaki on Reddit. Here each of them appears with each other's clothes, but sharing a tremendous feast of all kinds of food that seems to have no end. If Luffy even dares with an almost raw dinosaur!
This fan art may be a bit of an exaggeration, but it can be said that perfectly represents how greedy Luffy and Goku are and does not leave much freedom to the imagination, because it has soaked them the first time.
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