Champion interactions that you feel Riot missed
When Jinx first came out, I was a little disappointed that Vi didn't have some hidden trigger activated to let her special-taunt Jinx. That, and Jinx didn't get this gem against Sona.
-> 
: You can't scream? Wow... you're no fun at all.
To that end, we need to suggest to Riot some interactions between Champions that they should put in sometime in the future. Try to be in-character with your picks.
I'll give a few examples. Don't expect every one of them to be 100% winners.
-> 
: Come on, Master! Give me a challenge!
-> 
: You WISH you had my fans, bro.
-> 
: Crawl back to your den, foxy. This is my turf!
-> 
: Your Council couldn't restrain me. Now you'll be paying the price!
-> OR : Thirsty... want milk!
-> 
: "Double barreled payback. My favourite."
uses fear on 
uses Crystallize near 
> 
Wanna play with me?
> 
So you want to impress me? Hmph. Try and act like a knight and then we'll talk.
> 
Hi... uh-Tristiana. Lets have a good fight... 
> 
I'm going to show you what a true machine looks like. / Uh oh, did I step on one of your... bugs. Heh.
> 
to 
"How many have suffered at your hands?"
"Is harm all you can do?"
"Thank you, Warwick, you have taught me much of this world."
"I will not save you, Warwick."
"I will not hate you, Warwick."
-> 
Every void champ other than him "Your hunger serves no purpose"
-> Joke: "Our Forecast for today is cloudy.. with a chance of SWAIN"
-> Debonair 
"Nice Suit"