Two Troublesome Toplaners
and 
Likes:
- Lane bullies
- Ranged basic attacks
- Oppressive
- Bursty
- Snowbally
Diffenerences:
- Magic damage vs Physival damage
- Team fighter vs Split pusher/skirmisher
I think both of these champions suffer from having a little too much. They just do too much. They get nerfed to a healthy state, but it no longer feels satisfying to play. I think they could both get the same treatment. I would suggest to make them both melee.
I dont personally know what to change in Kennen's kit to supplement that change but with Quinn Inthink you could keep her pretty similar.
My idea for Quinn:
So first thing is first Quinns base stats need a complete overhaul with her being melee. I would give her 150 attack range.
Quinn's passive would be practically the same just adding that Quinn switches to her crossbow on her either off hand or on her back and gains 375 range when attacking a target marked by harrier.
Her Q and W would stay pretty similar just maybe different CDs and damage numbers.
Her E would need a change though. I want the same idea on it, but when she is over 250 units away from her target she only bounces back to her AA range and when she is less than 250 units away from her target she bounces back the same as she currently does.
Also everytime you proc your passive Quinn reduces the cooldown of her E.
Her Ult will probably stay the same.
So what do you all think? I would love to hear your ideas and what you think of mine.