A really sexy idea for jhin.
You know, jhin could really be my masterpiece. Hes so underpowered, theres no way I could overpower him I got my hands on just one ability. Like. Ill try, but since I cant this is basically the best way to balance him. Put him in the hands of a bronze adc main, game designer.
OK. So buff his e so it has a regular cooldown. Like 6 seconds per mine. If he has three charges built up (he gets an extra one every 3 lvls of his e) he consumes two charges and throws a mother fucking grenade. Boom. 440 magic dmg. One charge left means he can immediately place a mine. Mines cost one charge. Grenades cost two.
Give the grenades a victor like rolling interface so you can sort of directionally swipe and bowl the grenades after a short toss. That's the casting interface. Boom. Give me a job, Riot.