Evelynn
Le'ts talk about Evelynn for a second and maybe someone will agree and not say "nope". I want to first say Evelynn is my favorite character. She is so awesome and fun to play but she has some flaws, that I've seen playing her, and hey, maybe I just suck at the game, but I think it's worth looking into.
One. Compared to other champions, right now, she's really weak. She can't go into fights by herself even lvl 1 against the other jungler. I've gotten her to 500 ability damage but she is so squishy and her cooldowns outside of the jungle are super slow. Maybe I'm just not using the right items but my bf looks over my shoulder a lot and suggests stuff and he's been playing 6yrs to my 3 weeks or maybe we both suck, who knows.
Two. Her "W" has this huge circle distance but no way to bridge the gap to effectively complete a hit nor does she have any speed compared to a lot of other characters. Maybe making her "E" have more of a distance circle, like as big as Neeko's ult circle comparatively to try and effectively land the next hit to charm with her W. I don't know.
Three. She's slow. Every character can effectively run away from her or run after her. Jax, Hecarim, Garen, Akali, Shaco, Tryndamere, Udyr, Warwick, Neeko, Rengar..... to name like every character I've tried to run away from to save my life and they still caught me shadow form or not. You'd think as a champion that is supposed to be an assassin, she'd be a little faster to get in and get out. But if you look at these other champions they have ways to get in or if needed get out. Yes, Evelynn goes invisible but that circle where they can see you is really huge and the speed boost is nice but not enough compared.
If these few things could be looked at I think Evelynn would be a more balanced champion and be at even grounds with others. Now, if you think maybe I'm not picking the right items or not sufficiently using her. By all means give me pointers please.