Leodip as in Leo and Dip, both are the first three letters of name and surname. I use that pretty much anywhere, but where I need a double account or stuff like that it's generally Anime stuff ("Konata:3" is one of my favourite, although some days ago I saw another player on YGOPro using it, dang it).
Mostly called Leo, have seen Leod, someone with broken keyboards call me Leodi, Leodp, Ledip, Lodip, or stuff like that, although the "L" is always there. My female classmates call me "Dipi" (you might understand it better as Dipy, it's basically the same, although "Dipi" is the first four letters of my surname, which also happens to sound cute), some of my male classmates call me "dpl" which I won't bother explaining since it uses dialect and stuff, but, still, it's the first 3 consonsants of my surname.
Leo is how I'm mostly being called IRL, some do call me via my nickname, but they generally don't bother considering how similar they are.
TL;DR, name and surname shortened.