Wouldn't it be nice if Gangplank and Miss Fortune had in-game quests like Kha/Reng and Lis/Ashe/Sej?
A possible suggestion for the hopefully not so distant rework he should get.
It'd be fun if other rivalries had their in-game quests, possibly with as little consequences on the game as possible (I understand stupid people might throw games just to try to succeed in the quest).
vs
vs
vs
vs
vs
vs
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vs THE WORLD!
vs
vs
vs
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any ninja vs any ninja
vs
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vs
there are a bit too many rivalries in the game for this.
vs
vs 
feud with
vs

since they are brothers and would naturally compete against each other for kills.
and
and
vs. 
VS
but I guess since Gnar/Rengar forgave each other and they're considered neutrals now were not getting that