My favorite character is also very obvious, but why he is my favorite is a bit more complicated. Believe it or not. I have had more characters than just Scion and Dennis, but they were all experimental. One being an undead pervert named Carl that leaned towards being a jerk. My first girl was a necromancer, who's name escapes me, that experimented with all forms of necromancy across all forms of magic. My first bad guy was a boy named Derek that swallowed people alive. My second girl was named Aoki and had ice powers and was friendly, but a bit morally grey. I once made a psycho pony named Grey that had a thing for knives and a desire to destroy/corrupt those he thought were overly good, in order to achieve a form of "balance" between the good and evil in the world.
If I'd give a trend. It is the unfortunate fact that most of my characters have some sort of slow spot in their mental facilities. Scion is impulsive and makes hasty decisions. Dennis is misinformed. Carl was single minded. The necromancer was a straight up scatterbrained ditz. Aoki was too trusting and a bit gullible. Derek had poor deductive reasoning skills. The character that had the most sense was Grey, and he was a psycho with no moral compass. All my characters have some form of stupid in them. I am not sure why this is, but I find it makes me believe they are more humanized if they have these flaws.