Why not make the CHAMPS Motivate or Insult? o.o
Here's what I mean, You got your Rough Characters (Darius for example) And you got your Hero like characters like (Garen) Lets say you are feeding terrible, Darius will semi- insult the summoner or ally teammates. "Stop being weak or I'll use my axe on you.. (ect ect ect...make up the lines.) Same goes for Garen like champs. They basically try and motivate you to do better, or give a praise if you are doing well."
Personal favorite when you ping on an enemy champ. (Lets say Teemo) .
Your champ would go "KILL IT!! Ignore everything else and KILL IT!!"