we have a general rule though you cant really pick the same champion twice.
So when we play we randomise our teams. so im with 2 of my mates the other 3 on other team. we then do our blind picks (its more fun to see what we pick at the end rather than try countering.
when you win that game you randomise the team again so i get two different team mates. we then "ban" champions we used last game that were clearly too good!
its so much fun. TT games last around 20-25mins most of the time. rarely are our games even. We either stomp or get stomped. Usually my team wins as we just go for so much cheese. aka team dunk or team void.