I'm pretty sure everyone has those champs they don't like playing in urf or aram and getting them would completely ruin the experience.
There's a low chance that you are put in a position where you do get that champ, as it does happen. A quick workaround for this is to have a personal black list that removes these champs from the pool in all random for yourself.
This is especially useful for players who don't own many champs and have games where the entire re-rolled champ section is grayed out; where getting a champ you'd hate happens more often.
This is the place to talk about any and all things in the gamer cultural space (video games, anime, etc). Mostly, that means stay away from stuff like religion, sex, politics, and social issues, though some exceptions may be appropriate (e.g., internet legislation).
Remember to follow the [Universal Rules](http://boards.oce.leagueoflegends.com/en/c/announcements/BjArMH2B-boards-universal-rules).