Which champion feels most fullfilling to play?
For me, it's Jhin. Jhin has insane amounts of damage, but requires so skill to play. Landing Q's in lane and getting cs is not easy, but feels better than other ADCs. Landing a W root feels great, especially if you used it from far away, or use it when your trap is triggered. E takes some thought to place. Where will they walk on? When the enemy Jungler ganks, I can just stun him with the help of my traps and run away, due to the speed boost. Speaking of his passive, it takes good planning to expend all 4 bullets to it's maximum potential. His ult feels amazing, especially when you kill someone with blind prediction. And killing someone drops your E there, which feels great. What is your most fullfilling champion?
Nobody escapes my 360 no scope across the map
I'm a support Morgana main.
I find her satisfying to play because her kit is damage and utility oriented and she feels super satisfying to play when you land bindings on the right target and manage to clutch shield someone and prevent a death or enable an engage.

that sweet feeling when you get 2 people to stop you from split pushing and kill both of them with a sick outplay (ha its funny cuz im just s4)
Watching sm1 die in less than half a second as you hit every spell before you even hit the ground.
if you manage to get fed you can 100-0 basically everyone except tanks with your q and ult (with maybe an e in between) and be able to 100-0 someone else in 30 seconds