Genie (Aladdin)

The Genie is the tritagonist of Disney's 1992 animated feature film, Aladdin. He is a comedic, larger-than-life spirit.

Why He Rock (pun intended)

 * 1) Thanks to his incredible performance in the film, he became a breakout character, and skyrocketed on the charts.
 * 2) He was played by a wonderful, wonderful man named Robin Williams himself, and his performance is entertaining.
 * 3) None of his dialogue was scripted; all of it was completely improvised, which is very impressive of his performer.
 * 4) He's a genie that bends magic on a regular basis, he's missing a marble or two, which makes his relentless over-the-top personality nothing short of amazing.
 * 5) He has a habit of breaking the fourth wall, which later inspired more characters to do the same, some examples being Pinkie Pie and Nepeta Leijon
 * 6) Despite being an extremely powerful being, he still contains some realism, as he has limitations.
 * 7) He's a great and memorable singer.
 * 8) Most genies jack up people's wishes, and make them wish they never met them, but not this guy!

Trivia
Disney's whole routine of three wishes from genies is older than you think. Aladdin is their fourth attempt. Here are the previous three:
 * 1) Used in the DuckTales episode "Master of the Djinni" with... well, Djinni.
 * 2) Used in the DuckTales special: Treasure of the Lost Lamp with Gene the Genie.
 * 3) Used in the Chip 'n Dale Rescue Rangers episode "A Lad in a Lamp"