99% of One Piece fans have this mentality and it’s both hilarious and sad. They need to be spoon fed every damn thing and 20 fodder panel reactions spelling out a character’s motivations and backstory in excruciating detail otherwise they don’t get a damn thing
Mihawk begins the story as a bitter, jaded man with no close connections. He mocks Zoro’s ambitions, humiliates him as much as he possibly can, and speaks only of killing time and chasing insignificant pirates. He’s achieved his dream, something that very few characters in the series have, but it’s made him miserable. He literally sails alone in a coffin, waiting for a swordsman strong enough to take his head.
Zoro and Luffy’s relationship inspires Mihawk to (briefly) reconnect with Shanks and he realises that Zoro’s selflessness is actually worth more than his talent or ambition. He slowly becomes less self-absorbed, loaning Zoro a boat to return to Sabaody, telling Perona to take care of herself and in the Perona novel, growing her a cacao tree. Mihawk learns to see the value in life and human relationships again, he slowly starts to reject cynicism and understand why Shanks bet so much on the next generation. Anyone who calls him bland or uninteresting is simply not reading the manga.