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Suprised Nunu hasnt been mentioned.
-His jungling is one of the safest in the game, so his health during lvl 4 ganks is very high without having to go back to base.
-His mobility is thru the roof being able to start with boots+1 and having Bloodboil. Easly being almost anywhere on the map when needed.
-He has a ranged slow/dmg on a very short CD.
I guess it depends on what you meen by ganker. Someone that can come out and blow peoples faces off, or someone that can come out of the jungle and ensure that your team gets thoes kills?