ok so I try to share the same amount of myself following these rules.
my OCs have:
something I like of myself, something I hate of myself, a feature of the person I'd like to be, and what I wouldn't want to become.
when we create a character, we just make it a part of ourselves, and such creating a reflection of either us, or someone close to us. and you'll have a better control over this if you do it consciously.
for example, my main character is:
sassy, but can't keep his mouth shut, he's very resourceful but tends to focus to much on himself and tunnel focus on his objective, sometimes, leaving people behind.
Then there's Larry:
He's a dreamer, but can be oblivious to what's happening around him, he sees the good in people, even when there isn't, but he is very dependent on his family and friends.
like I said, I try to do this fully aware so that I can fully understand their motives, control what they do without many inconsistencies.
but if I had to say WHICH is has the most of "me": I'd say is this guy.
and if I'm being real, the fact that he's so similar to my persona was pure coincidence.