So when doing runs for co-op classic mode only player 1 has too be the character you want the post a run for? Or does both player 1 and player 2 have too be the same character for example if i wanna post a run for Roy do both me and my partner have to be roy? Or do i just gotta be roy and player 2 can be whoever?

Player 2 can be whoever. I suggest you watch a run. That'll probably answer all your questions

You didn't watch a single co-op run before asking...?

I did but some runs had both same character and others didn't wasn't sure what the deal was