This is exactly what I'm all about. A character that can overcome tragic personal circumstances and emotional adversity, and emerge from it as a heroic and admirable figure, is simply by far the most rewarding for me to read or write about.
Conversely, I enjoy writing such characters but instead of emerging as victorious over their trauma, they compromise.
As much as overcoming their past is rewarding, I think it just undermines how far pain actually burrows into people, in many occasions. Of course, it's fiction; having it be wish-fulfilling isn't wrong. But for me and some others, it just feels fake. It feels cheap. Instead of a protagonist overcoming their pain, it's the author constructing an ache that's tailor made to be overcame by the protagonist.
Speaking from experience, some problems aren't solved by looking down intensely at your closed fists. Not all pain dissipate with one heartfelt speech or life-changing moment. Those strong enough sticks with you like a baggage and, if heavy enough, changes you on a fundamental level. We're only human, after all.
As I've said, it's not bad to write a character that overcomes his pain, and it isn't unrealistic either. Luffy from Wan Piss steps up from Ace's death. Rudeus from Mushoku Tensei moves on from his self-admitedly 'tragic' past. They are still great characters, but not ones you'd point towards paragons of writing real, human characters.
Instead of writing a character that steps above reality, I'd like to write something that hits closer to home. I want to write a character to still carries the permanent effects of his past, but moves on regardless of it. I've been trying not to bring up his name for four paragraphs but fuck it; Guts from Berserk is the perfect example for this.
Guts doesn't just ups and forgets about everything post-Eclipse. Hell, not even the things pre-Golden Age. Raped as a kid and betrayed by his parent AND partner, he doesn't just forget about it once he gets his companions. He sees them as a melancholic reminder of a past he never had as a child and unwittingly threw away as a teen. He doesn't fall to become a victim, nor does he just becomes okay with his new friends. The pain is still visibly there in his actions and behaviour; he just lets new people into his life in an effort to move forward towards getting an upper leg over his trauma.
I've seen some people try to do the "heavy trauma gotten over" plot and most of them fail, simply because the efficiency in which their characters recover either makes said characters look like sociopaths or undermines their traumatic past. Worse, if a character just ups and trusts a protagonist from judge of surface personality alone and then reveals they've been a rape victim before. I'm aware people treat trauma differently, but really? Not even gonna show the dangerous, untrusting solitude that comes with it?
Wish-fulfillment is fine and all, but for me, I prefer a bit of realistic comfort from my fiction, especially in the department of pain. Who in God's green Earth wouldn't want to get over their past at a snap of a finger? But that's not how it is, and instead of wishing for miracles, I'd rather work for a compromise to get as far away as the deadzone as possible. If I can't get far, then at the very least, I want to see someone who does. Someone who doesn't just shrug off the pain, but doesn't let it wholly define them either. They catalogue it, put some sticky notes as indicators, file it among other experiences, and move on with their new information.
Not everyone can get through the thorny bush that is a painful past; but at least we can move on with it. As lesser of two evils, it's better to lick the wounds than to have it fester and rot.