Excuse me, Ms. So-called “I-know-what-grammar-should-be-and-what-it-shouldn't-be-in-a fictional-story” beta reader, you do realize that Dante DOES have emotions/traits other than being cocky, flippant, and an a**hole at times, right? You do know that he can be happy, sad, angry, upset, irritated, joyful, surprised, calm and the like, right? I don't know if you've played the four games or not, but his persona isn't strictly like DMC3's in the other three games. Even then, at times, he WAS angry and SAD during certain times.
Why do you feel the need for everyone to write a certain way when everyone has their own style and technique to do so? Maybe you need to stop trying to force your preferred writing style onto others and only read styles to your liking. Oh, I'm not sorry for using capital letters when I'm TRYING to EMPHASIZE a POINT. And it's not like it's in every paragraph in every chapter, it's for a comedic effect. Damn, if you want everyone to write in a certain way, the stories would all be the same in tone and style.