I want to have that one champion in my back pocket that I can always lock in in 3 or more roles and not be worried. I thought of a couple champions but they're more mechanically hard. Like Lee Sin...I am confused on which one to buy...I have those champions in each role I'm good at. Top lane Vlad, Mid Xerath, ADC Tristana, Support Sona/Leona.
Anyone have a champ in mind with a lot of potential like Lee Sin that I could play in 3 or more roles?
Here you go
Top, Mid, Support
Anywhere and everywhere
Top, Mid, Support
Top, Jungle, Mid
Top, jungle, Mid
Top, Jungle, Mid, ADC
I tried to keep it to mechanically simple champs
Kayle, anywhere
I've taken Karma or Zyra everywhere except the jungle. For jungling, I stick to WW, Yi and Eve (I started as a jungler S1). You want to have the best possible control for your lane and minimize gank potential, so find a champ that can outzone if you are stuck outside of the role you are comfortable with.
I have seen people take J4 everywhere, that guy is an amazing champ (his flagpole bob annoys me so I don't play him much). I've seen him decimate midlane, control a jungle, outpush a Trynd toplane and completely wreck botlane as a support and an adc. So if you want to learn just 1 champ to do it all, Hail to the King, baby. 
nidalee
There's almost no champions that can be played in three roles anymore...Riot wasn't a fan of that so they tweaked most all of them. There's really only a handful....Annie is one of the best...Top, Mid, and Support. Nidalee would be the other at Top, Mid and Jungle. Anything else...is playing at least one role very much out of the standard meta despite what people are claiming.
Lee Sin can pretty much play every role..
Top: effective dueling, strong teamfight pressence Jungle: Duh Mid: its not totally meta but i once went 26/4 doing it so nothing is stopping you Support: Easy harass with q, low CDs, Sheild with w and a kickeroo ADC: kinda troll pick.. But yolo.
I Top, Mid, and Support with Karma very well.
Just watch AnnieBot's stream.
JG Top mid
JG TOP MID
top mid support
top mid jungle support
top mid jungle (all very strong)
EVERYWHERE
top support jungle
top support jungle
EVERYWHERE
jungle top mid support (kinda)
can be played in every lane
Top: usually a bruiser, mixing tankiness and damage
Jungle: a strong, if not FotM, jungler who can be built as a pure tank or with some damage
Mid: glass-cannon J4 is a treasure that should be played at elast once by every league player. It falls off a bit late game, but your burst damage is incredible
Bot Lane: J4 is one of the best kill-lane options out there (along with 
, 
, 
, etc.) A bit gimmicky, but hilarious.
can do all of these as well, but tends to be more damage focused.
kha'zix amazing carry ability. Can go mid, top or jg. Harder to go lane with him unless you know the matchups well and know how he does in lane which a 1 trick pony will learn and know. He harder to play but he is a very powerful champ. Has one of the highest if not the highest dmg outputs while they are isolated and in lower elo is real easy to get plus with the buff to his isolation range even easier. I am a 1 trick pony with him and i love him to death. Plus if he gets taken or banned you can play rengar they have similar play styles and abilities. Another option is kennen can adc, support, top, mid. Him adc is surprisingly very powerful once you get items. And ap kennen does a ton of dmg that people tend to under estimate how strong that yordle is
1 trick pony
Mid, Top
Top, Jungle, Sup
Mid, Top, ADC
Top, Mid, Jungle, ADC, Sup
Like Everywhere
Some kind of troll picks but meh
Nunu is a good jungler and support. His top and mid isn't as good imo (you can't counterjungle if you can't push), but it's viable, I think.
Vlad can top or mid, Xerath can mid or support, Sona can mid or support. Leona "can" top or jungle, although support works best.
