It has be awhile since we got Zed and I think getting another ninja like champ like Shen would be interesting.We have had different types of ninjas but I think a melee or some type of ranged champ would be interesting.
We could have one of zed's students or something. It would be cool if he had the same W as zed, that could copy his abilities. A ninja adc would be good, since we dont have one yet (kennen primary role isn't adc)
Would insta main.
Maining 
just because he's ninja and nothing else.
"Ninjas" are overrated.
Tank ninja/Shen is the way to go.
check my idea and tell me what u think about it link:
http://boards.na.leagueoflegends.com/en/c/skin-champion-concepts/zyud2nN4-new-champion-seniro-the-shadowless-ninja
I don't see a new ninja champion coming, because he would overlap with one of the current ninjas. After all we have: the shadow ninja, classic ninja, elemental ninja and tanky ninja...
