It wouldn’t let me choose another character after I picked Beatrix. I was in Chaos Rumble.
You can in the first 30 seconds as long as you are on the character screen. Once the music changes, you are locked into your character.
I was told that you could change characters too but nah. Only in draft mode or what?
You can change them, but it is within a certain time and then you are locked in.
You can change characters but you need to press O on PS4 or B on Xbox1. I have no idea what it is for PC. But you can only do it in the first 30 seconds of the lobby.