Chainsaw Man shares the same level of passion and drive as most heroes from Shonen manga, who have a tendency to yell out their dream for the umpteenth time (usually to an overly powerful enemy who's way stronger than they are). Although every Shonen hero possesses a proprietary dream that's unique to their own special world, they are all usually farfetched or way beyond the realm of possibility. These dreams are so unfeasible that they require numerous volumes for a character to achieve anything remotely close to what they so desperately want.
Naruto dreams to be the next Hokage even though everyone in his village fears and despises him. My Hero Academia's Deku yearns to be the number-one hero like All Might even though he's quirkless. Fire Force's Shinji wants to be a hero and save as many lives as he can, but he possesses a power that can destroy their entire world. Dragon Ball's Goku always strives to be the strongest even though he's essentially as powerful as a god and will put his life on the line just to make a fight interesting. Black Clover's Asta wants to be the Wizard King even though he possesses no magic. One Piece's Luffy wants to be king of the pirates in a world filled with pirates.
But Chainsaw Man's dream is completely normal, even downright ridiculous in some cases, and nowhere near as grandiose as the rest. Before becoming Chainsaw Man, Denji lived in a dilapidated, bed-less shack because he spent every waking hour trying to pay off the debts of his deceased father. He therefore did not have enough money to buy food that wasn't rotten or any time to fool around with a girlfriend or just experience a normal teenage life. So when Denji becomes the devil Chainsaw Man and assumes the role of devil hunter, what motivates him is fresh food to eat, beds to sleep in, girls to fool around with and good times. Denji doesn't want to become the strongest devil or the best at hunting his kind.
This is not only refreshing and more relatable (because there's unfortunately no such thing as a Wizard King), but it puts Chainsaw Man in some humorous situations. For example, Denji only agrees to save a cat so he can go to second base with a devil fiend. But his main motivation throughout the manga comes early on in chapter 12 when the love of his life Makima promises that she will grant him any wish if he catches the Gun Devil. Denji is also very easy to please on account of how simple his dreams are. So long as he can eat anything fresh—even canned food or some treat at a gas station that everyone else takes for granted—he's happy. Additionally, when he and his colleagues are trapped inside a hotel building with no way out right before Chainsaw Man's bloodiest battle, everyone else panics, but Denji takes advantage of the situation by falling asleep in one of the many comfortable beds there.
Mangaka Tatsuki Fujimoto obviously understands the unprecedented normalcy of Denji's dream in a Shonen manga series and even causes his eponymous character to get into arguments about whose dream is better. For example, his colleague Aki wants to avenge his family's death by killing the coveted Gun Devil. Tatsuki Fujimoto reveals this is everyone's dream and not at all surprising (like every Shonen manga out there).
But it's not all fun and games. As the latter chapters reveal, easily attainable dreams can just as easily be taken away in tragic ways and are more than capable of crushing a character's soul. Denji's reaction after getting his own dreams shattered is especially disturbing. Unlike many Shonen heroes, one of Chainsaw Man's dreams evolves in a heart-wrenching and realistic way, from just wanting to fool around with a girl to being willing to do anything just to be with the person he loves, even if it means getting treated like a dog.