Atypical champ choices in Bronze

ive come to see a trend in bronze recently, when it comes to champ selection.

example: volibear(supp)- high aggression at the start. high dmg. lots of cc. zone master riven(mid)- high dmg at the start. high mobility. high cc. snowball orianna(supp)- utility. harass. relatively high start dmg etc

these champs in these roles seem to be difficult to deal with in bronze, though are not used often. i am interested in finding some more nonconventional, hard to deal with champs that dominate bronze