Create A Champion From Existing Abilities
Your Q W and E can be any champion's non ult ability, but your ult can be anything.
Behold, the stupidest champion ever:
Passive: Fizz Passive Q- Vayne Q W- Riven E E- Yasuo E R- Tristana R
Your Q W and E can be any champion's non ult ability, but your ult can be anything.
Behold, the stupidest champion ever:
Passive: Fizz Passive Q- Vayne Q W- Riven E E- Yasuo E R- Tristana R
Nautilus Q Thresh Q Blitzcrank Q Skarner R
Q: http://ddragon.leagueoflegends.com/cdn/6.19.1/img/spell/RocketGrab.png W: http://ddragon.leagueoflegends.com/cdn/6.19.1/img/spell/JayceThunderingBlow.png E: http://ddragon.leagueoflegends.com/cdn/6.19.1/img/spell/TaliyahE.png R: http://ddragon.leagueoflegends.com/cdn/6.19.1/img/spell/ThreshRPenta.png Ragdolling intensifies
Passive-
Passive
Q-
Q
W-
W
E-
W
R-
R
I'm assuming when I say Sion's W and Nunu's Q, it includes the Passive and Active effects.
Passive
Q
W
E
R
Off-handedly I'd say something like:
's Passive
Q:
's Q (Turrets)
W:
's W (Bush's and passive on-hit+range increase while in bush)
E:
's E (Snares)
R:
's R (pulls and locks down enemy champs within the circle of surprise)
passive
q
w
e
ult
Dear god what have i done.
Also here's another one
passive
Q
E
E
R
I think this might be more broken than release Xin.
Passive: Tristana (0-119 range) Q: Jinx's Q (+75 / 100 / 125 / 150 / 175 attack range when toggled to Fishbones) W: Ivern's W (+325 range when in brush) E: Kayle's E (+400 attack range when active) R: Mordekaiser's Q (three-use on-hit effect) ...Or Vayne's W. ...Or Kog'Maw's W. ...Or any on-hit effect or steroid, really.
On a Caitlyn base (650 base range).
I heard you like getting instagibbed from triple your attack range. With all abilities active, that's 1669 attack range, with a Morde Q active. Toss on a Hurricane and you've got a team wrecker. Even with Q on Pow-Pow, it's still 1494 range, well outside the cast range of most abilities and the attack range of all basic attacks.
Passive- Voracity
Q- Playful/trickster
W- Playful/trickster
E- Playful/trickster
R- Playful/trickster 
Well
Passive:
Q:
W:
E:
R: 
Easy!
Passive - Who cares?
Q:
's Q
W:
's W
E:
's W
R:
Q
Put down the turrets and boxes at will and wait. As soon as an enemy comes up, you snare them for the freest blitz hook of your life, bringing them to turret/box range and one shotting them.
passive
q
w
e
ult
and
basestats
guess what inspired this monster of an adc
passive
Q-
Q
W -
W
E -
E
R -
R
Martial Poise (P)
Passive
Mace of Spades (Q)
Q
Rend (E)
W
Black Shield (E)
E
Intervention (R)
R
Champion Passive: Berserker rage 
Q: Switcheroo 
W: Silver bolts 
E: Quickdraw 
R: Subjugate 
Passive
E or
Q Depends if you want one kill really badly or alot of kills.
W
W
Ult
You use the extremely long range dash to get in their face, then you spin for 2 seconds to max bleed and dunk them. Then you have a new dash and that dash causes everyone near the impact to have max bleed.
Trait
W
W
You guessed it, W
Ult
So a hit and run champion...