I know what you mean, guys. It seems like many of us have seen the same-old same-old dramatic, tragic past of a character that has been written too many times by millions of others. I too have seen the Mary Sue and Gary Stue kind of bios as well. I especially don't like the oh so perfect Mary Sue kind of characters. A good character in any story would have flaws of some kind, because no one in the world is perfect.
My mythical magical creatures have flaws, too. Just because they are supernatural it doesn't mean they have to be invicible and have unlimited power. Nah! That ain't gonna fly with any of my characters. Even if they are unrealistic and magical, they will have flaws and weaknesses. My unicorn fox character has weaknesses and flaws. She may be immortal, but she can be injured and killed. She has limited amounts of magic. My manticore character, Melina, has no magical powers whatsoever. She too can be injured, captured, tamed, or even killed. She has fought a few battles, but didn't win them all. It doesn't mean she's weak, it just means that she is normal (no godly powers).
None of my characters have the dramatic past of "My parents died because they were murdered by (insert reason)". No way! Most of them led normal childhoods then moved out of their parents' den when they were old enough to take care of themselves. If any tragedies happened, it was due to whatever tragic roleplays that character was exposed to. Like if my character was part of an RP where her closest friend died in a tragic battle, or she lost her mate in a war, then that's when I include it in the bio.
One thing I don't like is when people don't play the character they described themselves as. What I mean is, I've seen some bio's where the character description said that their character personality was "kind, sweet, loving, helpfull, shy, curtious, ect." But then when I interact with this supposedly "gentle" character, I get something totally different. They start acting all hostile, rude, disrespectful, and sometimes resort to violence that esculates to powerplaying..... Wait a minute! What happened to Miss Sunshine-daisys-SmilesAlot? She's starting to act all rough and tough, with a terrible attitude. Did I miss something here? Are you only supposed to act kind to your close friends? If so, you should put that in the bio too. Or at least write "Personality may vary".
That's all I have to write about for now.