This champion could teach you how to dougie!
THAT'S RIGHT IT'S VI!!!
WHAT'S THE NAME OF THIS OLD LEAGUE GAME MODE?

Aka The Minotaur
ALISTAR! 

who's droppin it like it's hot?

NASUS!!!!
WHAT IS THE NAME OF THIS ICONIC MAP?

The Dark Child?
ANNIE!!!!
IT'S THRILLER TIME BABYYY WHO'S DOES THIS ICONIC DANCE?
WAAAAAAAAAARWICK
WHAT IS THE NAME OF THIS OLD MAGE ITEM PEOPLE WANT BROUGHT BACK?

BARD :D
TEE HEE HEE WHO DOES THIS FUNNY DANCE?

DUH KATARINA SORRY COULDN'T FIND A GIF FOR THIS ONE
how many champions were there when league launched?
40
tHE MISSING LINK
GNAR! 
GOOD LUCKY THIS ONE'S TOUGH

ZIGGS!!!!!
Vilemaw/maw whichever works :)
THIS ONE IS TRICKY SO DON'T THINK OF A SIMPLE ANSWER :) Curator of the Sands
NASUS :O