Reworks: Who Needs Them, Who Should Never Have Them?

I was under the impression that LoL is an ever evolving game, where absolutely no champion is beyond a rework, and I believe that with time, every champion should be reworked, in some way. However, there are plenty of players who bitch and moan whenever Riot says they are going to touch any champion..... except Urgot, we can all agree on Urgot.

So my question is, in your opinion, which champion is perfect and should never ever be reworked?

I bring this up because I was playing Leona and realized that I never cast my E without following up with a Q, and I suggested she should be reworked so they were a single ability, giving her more gameplay options to play with and I kept getting asked, "why rework Leona?"