What does symbol in the upper left hand corner of the character mean?
If you mean the symbol visible in the green fog on character select screen, then that is the character logo. For Jago it’s a stylized tiger, but it is unique for each character.
If you mean the logo at the top near your name, that’s just a bit of flair the player can select for their name card. Different ones have different unlock criteria, but they tend to be about playing a certain amount as a particular character.
That’s double XP.
You get extra XP for the game modes where it appears.
Lol. Yeah, that makes a lot more sense for what he was actually asking about