Please do not type : "All" or "I find them all easy when I am fed" Because I think even if you are fed, and there must be one particular champion you felt easiest to kill. (Even you are lv18, a lv6 WW may not be easier to kill compare to a lv6 Teemo.)

Example: As a Renekton player, I find Xerath my easiest pray.

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Graves --> pretty much everyone but Yi. And riven/fizz are hard to catch.
Malzahar --> tryn.

Caitlyn -> Garen
Karthus -> Anyone that needs to get close to me to be effective
Swain -> Burst champs like LeBlanc or Kat (oh noes I'm still alive!)
Ashe -> Garen again, udyr etc

I got no love for Demacia, apparently.

Mordakaiser with my support.

Their entire bottom lane and their jungler at the same time during a gank.

As Nasus, I find Tryndameres pretty easy to kill in lane (post lvl 6). Out of lane phase, any auto-attack champion.

As Morgana, I find Veigars very fun to lane against. He throws down a box, and expects me to get stunned so waits around and unloads. Spellshield through the box, QWR for insta-gib.

With Riven I find any non-tank/subtank rather easy to kill, honestly, except lux and morgana. CC shuts me down. But, take Yi, for example, if both evenly golded and evenly leveled I would win. Unless they just lolmeditate as AP Yi, then I just outdamage them anyways. Win win, only a little longer.

Vlad: Anything. :trollface:

Leona: If you don't have a Spellsheild or Banshee's consider yourself GG'd. Otherwise, anybody with it can GG me. Eventually.

Rumble --> singed

As AP Singed any unfed squishy and some fed. Caitlyn and Xerath usually the easiest