1)Oddly enough I was looking for a free animation program to download, saw the link to this website, thought it looked fun, and just went on from there. 2)By username thingy you mean the avatar icon/profile right? If so, I literally just did a random animation of a cat-like face and decided that I liked as an avatar profile lol. 3)Honestly, I've been drawing since I was 3 years old and I'm still trying to figure out what my "style" actually is even now. But mostly it's just practicing (cliche I know) and referencing from real life and looking at other styles I like. Thank you so much for asking! <3