I loooooved old nidalee, but new nidalee is sooooo much fun too. I like new nidalee a lot. She's super op atm though xD
I think the fact that riot maybe her super viable in the jungle is a horrible mistake. She was really good to begin with, and now she's stupidly op and amazing at every role.
Vayne is just so mechanically fun.
I was really sad about the recent Ahri changes, but when she came out I got really happy. Her playstyle is changed but I think she's still a pretty fun champion.