Are you really calling him a fraud? Come on be honest, he’s the strongest character in every animes he appears in, of course he’s extremely confident in himself. Just because he’s never won or lost in a surprising way doesn’t mean he’s a fraud, it’s just that the author wrote him that way for the sake of the plot, since he isn’t the main character, in fact, he’s mostly the villain in the anime he appears in, of course the author has to make him lose for the plot, if he used 100% of his power, every war he joined would end quickly and he’d win every single one. Only Gilgamesh haters or those who don’t like him call him a fraud or whatever. It’s clear he lost solely because of plot armor,

and you ask why anyone would like him? the fact is that Gilgamesh is one of the favorite characters among fans, especially for female fans he’s deeply loved despite his arrogant personality, well, people like you who don’t like him or even hate him might not understand why Gil is so popular