Jhin may be a strong jungler.

ITEMS

Will give hit AD + on hit effect. If the AS -> AD ratio is 1:1, he will deal 40 AD + 30 magic damage on hit. Thanks to his passive, he won't suffer the lack of AD on the devourer to much. (only lose 20 AD compared to the warrior) Will proc his 4th hit crit twice. (?) He will deal 40 AD + 60 magic damage on hit, combined with a , he will deal lot of mixed damage. Also, his Build sounds very cheap, wich is nice if played in the jungle.

Pros His W will be strong for ganks, especialy with or laner's help. His E is strong for map control / objective control, or to prevent counter ganks. R "snipe gank" for finishing an enemy that got away with few HP (after a gank or laner burst). It could also be strong to help a lane that is warded and just need some extra damage to win the fight. (On a botlane for exemple). If it can hit monsters, it could also be a nice tool for stealing drakes or nashors.

Jungle Clear

I hope his spells works on monster, so he will be able to clear well. 4th hit crit will give him the speed boost, and help him kite. Q will do lot of damage. (Few hits on the small monster, then Q ) W if the damage works on monsters, it will give him some nice AoE paired with his Q.

Though ?