nidalee, shen, shaco, teemo come to mind, but it can be anyone who meets a few basic criteria: fast lane clear, tanky, good escapes, and HAS TELEPORT.
it pains me whenever someone decides to split without teleport, because simply put the enemy team can and will initiate 5v4 against your team lategame, and if it is even close to an even game, they will come out on top, and goodluck out pushing the enemy team after they decimate your team. also, imo adc's should never split. the risk is just too high. clean waves on your side of the map but never overcommit. let your team protect you and carry the game.
EDIT: i would love to know why this is downvoted...please post so i can laugh my ass off at how retarded you are.