What are the most satisfying champions to use?

For me, Vel'koz is either number one, or just shy of number one. Getting a multi-team knock up followed by an ult is extremely satisfying. Everything about hitting the perfect Vel'koz combo is fantastic. Great sound from the ult, awesome visuals, especially with his arclight skin, ect. Some champions obviously have really fun combos/are just satisfying to use, so what are some of your favorites to use?