Tfw you want to ban an op champion

Take it from this fine English fellow from the EUW servers. https://i.imgflip.com/g6nfz.jpg?NoRedirect

Talk to your teammate in a professional and mature manner. Ask that player "My good, Sir/Madam. Sorry to trouble you but you are the last pick but I really want to ban this ridiculously overpowered champion so the enemy team won't get it. Is it okay if i ban him/her?"

If he says "No": Then pray to the Elo Gods that person isn't a 0/10 salt shaking player.