Phelmo
CAGiversary!
Twitch isn't bad if you get reasonably fed early game (which honestly isn't that hard on him).
Vayne is really good vs bad people, if they don't know how to shut her down or to target her then she can just get fed really easily and go on to 3shot everyone, on the other hand if you are playing against good people then you will struggle early game and never really shine.
Caitlyn is probably a good champion to start learning on because of the range, Graves would also be good, but I feel not quite as easy as Cait.
Vayne is really good vs bad people, if they don't know how to shut her down or to target her then she can just get fed really easily and go on to 3shot everyone, on the other hand if you are playing against good people then you will struggle early game and never really shine.
Caitlyn is probably a good champion to start learning on because of the range, Graves would also be good, but I feel not quite as easy as Cait.