Match Point Heimerdinger
Don't judge me on the art, just the concept (as I am in no way an artist).
To go along with Dunkmaster Darius and Lil' Slugger Trundle, I present to you Match Point Heimerdinger. This is also building towards a team of 5 sports-related champions (not counting the special ones like Mighty Jax or the soccer ones that already have a group).
Heimerdinger wears the white headband and the traditional white shirt and shorts/pants. He holds two tennis rackets and his basic attacks are tennis balls. His turrets will become tennis ball machines shooting tennis balls at opponents.
There are plenty of new quotes that could be used as well, such as:
"Match Point!" "Aced" "Paralysis by analysis" -Arthur Ashe (old tennis quote)
Or this could be a simple skin with no new quotes or particles so it's a cheaper skin.