The word historietas translates to 'comic books', stemming from the word 'historia' (story) combined with a diminutive suffix.
In this superhero-themed track, Romeo Santos laments that his fantasies of having superpowers to win over his love are just "historietas" compared to real life. It is a fun and highly educational vocabulary word that perfectly ties into the song's playful references to famous comic book characters.
Romeo Santos is feeling completely helpless in "Héroe Favorito." He's in love with a woman whose parents are marrying her off to someone else, and he admits his own plans aren't working out: "Mis estrategias no marchan / Y crece la imaginación" [My strategies aren't working / And my imagination grows]. So, what does he do? He imagines he has superpowers, of course!
This song is a huge, romantic fantasy where he dreams of becoming a superhero to save her. He wants to be The Hulk to protect her, Superman to show her the universe, and even Batman so they could use the Batcave as their "nidito de amor" [little love nest]. He'd even be Spider-Man, climbing a hundred feet to her balcony just for a kiss. Despite all these daydreams, he knows he's just a regular guy with no powers. But he still wants her to tell everyone that her favorite hero is him: "Y si alguien te pregunta por tu héroe favorito / Dile que soy yo" [And if someone asks you about your favorite hero / Tell them it's me].