I'll go ahead and answer my own question, in a bump. 

I'm happy to say I don't use any "self insert" characters, though I'd like to think all of my characters have bits of me in them. Even extremely morally ambiguous characters like Alim/Amal, who'd cut you as soon as shake your hand. In a lot of ways, they're very much like me if I lost much of my inhibitions and my higher moral standards. 

It's easier to see myself in characters like Cyrdic from my Warhammer Fantasy roleplays. As a martial artist and military historian, I'm pretty obsessed with combat and warfare, despite my better judgement, much like him. I'd also say I'm very much like my character Markus, being a bit aloof and introverted, and very self sufficient, but able to pull off a leadership role when needed. 

Probably the character I'm like most is my mecha pilot Neil (unfortunately). Initially I made him around 9 years ago in another forum a long long time ago, far far away. He was meant to pilot his mechs in the same charming manner that I play Xbox live. I.E. I shit talk a lot, and while I'm good, I take a lot of unnecessary risk. He's got a big heart deep down, even if he hides it with bullshit and jokes, and we look a bit similar as well though I'm slightly stronger than he is as I'm more of a fitness nut than he is. Not to mention he turned out to have a very similar backstory to myself as well. Grew up on the streets, was always up to mischief, but worked a lot of jobs and became fairly well read, and he's only ever loved one woman (until now for Neil in his latest roleplay).