This is all completely off topic but interesting stuff

I enjoy talking about writing when I get the chance; it's fun to explore other minds ^^
I understand what you mean about similar traits popping up often. I guess alot of the time I idealize the characters, or sometimes I deliberately give them trait that gets in their way. I tend to draw upon past experiences and reflect them through these echo-personas. Writing is always an exercise in using your experience and imagination in tandem. "What if things were different?"
All good writing has some of your soul in it. When you write, you end up using a combination of your experience and imagination to make characters; you could write about characters you meet in real life, you might write about yourself, who you were once, who you are now, who you could be, who you want to be.
I have a pool of experiences and references that I draw on. Some traits tend to find their way into my work alot more than others, simply because I feel strongly about them.
So there is always a part of me in my writing too, my echo-self. But its not always the same part. Sometimes I chose to remember times when life was easy and I was self-confident, righteous, and arrogant. Other times I remember when I was wounded; filled with self-pity and regret. If there is an experience (direct or indirect - things that have happened to you directly or to another character in another fiction) that can be drawn from to write, use it, bend it to your whim ^^
TLDR;
Keep using your echo-self, and drip it into your work. For every experience in life will leave it's mark in the pools of your soul. Draw always from this pool, but don't forget to add your imagination to it's contents. Your work should inspire you. It won't always, but sometimes when you breathe life into something, it breathes back a little. It's what started me writing in the first place