@Riot's Champion Squad: Do you like Orphans?
https://www.youtube.com/watch?v=8oHFnoYzT5g
I personally would like a champion like the Orphan Of Kos from Bloodborne. For me this was a fun, yet highly stress inducing, fight mainly from how he begins the battle on most playthroughs, with a huge leap and an exciting scream "IYAAAAAAOO."
Imo there aren't any champions who sound specifically excited to fight, sure there are these nutjobs 
but the excitement they spout comes from looking forward to blowing you up, not fighting itself. There's also 

who seem to seek the challenge against their goals/ideals rather than the battle.
The closest to what I'm looking for is in
. His VO sheds a bit of light on what I'm looking for: The "Wooo!" when he uses E, his taunt "Improve your skills! Then come find me again." are probably the closest to what comes to mind from me but playing Wukong doesn't feel exciting, nor is the rest of his VO or emotes. I'm thinking of a bloodthirsty Noxian or Undead who enjoys the dance of blood on the battlefield, someone who is a bonefied psycho for battle and does war cries that his/her mains who scream almost every time they used whichever ability it's on, similar to the way Garen Mains may scream "JUSTIIIICE" when they use their ult. Btw, they don't have to be an orphan.