Something Riot really got right (in my opinion)
Hand-animated deaths.
HotS uses rag-doll deaths, and they just don't have any character.
Jinx hair-heart J4 hanging onto his spear Leona disappearing in a flash of light Zac melting Lulu popping and her hat fluttering to the ground
There's a lot of character in many of the various death animations, and I like that feature.

Has a really sick death animation.
death animation is awesome as well as 
shreds guitar and explodes in a heavy metal storm