Preferred legend order for select screen

I'd like to be able to pre-set my 1st , 2nd and 3rd choice for character selection. So that way if my 1st choice is taken, it will automatically select my 2nd choice and so on. I keep getting in situations where if my main is taken, it auto selects a character I don't want. This is because I often multitask in between matches and miss the opportunity to pick a characters I like.