I beg to disagree. It very much depends on the focus of the work. In fact, I'd say the majority of literary works and most people in real life are without the types of flaws present in Reborn's characters.
In fact, many of the greatest literary works of all time include characters without deep flaws, as the flawed hero is itself a relatively new invention.
I can't speak for the types of people you've met that have made you come to such a realization, but if I were to tell you that my experiences with different people have convinced me of the opposite view of people you see, with most people being inherently good and without major flaws, you'd probably not believe me. So, for now, let's agree to disagree on this point.
Pardon me for saying this, I don't think you actually like reading about flawed characters as you claim, but instead how flawed characters come to grips with their flaws and seek to improve their flaws.
Personally, I despise reading about miserable people who through inaction or their flaws create misery for themselves and those around them. Case in point, when I read Crime and Punishment the main character made me feel incredible discomfort and disgust at how flawed he was as an individual. Despite possessing incredible mental faculties and great people around him who desire to help him, his own self-destructive tendencies warped sense of morality compelled him to act in ways to hurt himself and those around him over and over. And after reading how he ruins his own life, and nearly drags his family down with him, he never once surpasses or overcomes his flaws (in fact, he never even tries ).
Perhaps, you do in fact enjoy these types of characters, but every time I've stumbled upon reading self-destructive characters, or characters with no redeeming value, I've never been able to enjoy reading about them. Sure classical heroes always have a tragic flaw which is supposed to make them more relatable (case in point, classical Greek and Roman works), but for the most part, these serve as plot devices rather than as actual flaws. In fact,
I'm very happy that you find so much value in reading misery and suffering. But like you stated yourself, you don't like these aspects in and of themselves, but since they serve as vehicles to show how character better themselves and improve. In the end, I doubt anyone likes to read about flawed characters who remain flawed until the end.