The most versatile LoL champion in LoL, like Brand or Swain, are the best ones to one-trick, as they can be played in multiple roles in the case of an autofill.
Champions such as Leona, Thresh or Soraka complement Miss Fortune's abilities and playstyle.
Maokai the twisted treant is a tanky poke champion that can control the lane as a support. He can initiate and engage for his team during the late game!
If there is one thing you must have in fantasy, it is a Treant. Maokai is one, with a twisted body and pure soul, preserving life on the Shadow Isles.