What exactly prompts you to pick a new champion in ranked...?

I hear the stupidest things sometimes like, "She's really strong and op!" "I've played a lot of games with her" "I know all the matchups" "I played her on pbe all the time" "I play her for fun XD!"

Like, this is what prompts you man? Look this whole ranked for fun thing does get me ticked off because some of us are trying to climb the ladder and improve our gameplay. And to be honest this is worst thing ever about ranked in my opinion.

Unless your masters/challenger elo, stop going new champions in ranked.