Take any passive and 4 abilities from any existing League of Legends Champion and create your own kit.
For me: Passive: Lucian's Lightslinger Q: Vayne's Tumble W: Ekko's Phase Dive E: Quinn's Vault R: Olaf's Ragnarock
It creates an ultra mobile, anti-melee champ who uses their abilities for constant AA resets (so that OP Trinity Force).
Share your creations in the comments.
Passive: 
's passive
Q: 
's Q
W: 
's W
E: 
's E
R: 
's R
Teemo's passive (the one that makes you invisible) Q: Leona's Shield of Daybreak W: Sona's Aria of Perseverance E: Katarina's Shunpo (quicker cooldown, lower damage and damage ratio, trading the defensive boost for movement speed) R: Soraka's Wish
This creates an ultra-mobile assassin-support with a stun, heals, a blink and the ability to go invisible.
Q: Jax's Counter Strike W: Katarina's Sinister steel E: Garen's Judgement R: Wukong's Cyclone Passive: League of Draven(Spin to win=kills=TONS OF GOLD)
Recommended Build:
This makes an SUPER high damaging champion that spins to win the entire game and with the recommended build you automatically win
Passive
Q: 
Cleaver
W: 
Dark Frenzy
E: 
Essence Flux
R: 
Chronoshift
Result: A really hard to catch champion with kitting galore and really hard to kill
P: Ekko's Passive (Three Hit Speedsteal)
Q: Yi's Q (Leaping Engage+Invuln)
W: Thresh's Hook (Self-providing snares)
E: Rek Sai's Tunnel/Burst up (Mobility)
R: Cho's Ult (Omnomnom true dmg is awesome)
This creates a high mobility champ built for melee who can chase ad-infinitum, drag in enemies to start their own fights, and also passively build tank by finishing with a true damage ult.
Passive
Q
W
E
R
Passive: 
Resets
Q: 
Pulverize
W: 
Rake
E: Phase Dive
R: 
Last Breath
A mobile, heavy hitting fighter / assassin / tank who can initiate fights with a Pulverize / Last breath combo, and then mop up team fights with Rake spamming.
I thought of a kit completely from scratch for my perfect champion, and then they made almost exactly that kit.
Passive: Shurima's Legacy
Q: H-28G Evolution Turrets
W: Drain
E: Event Horizon
R: Glacial Storm
Pardon me while I become the most non-gankable person ever.
Little turrets, big turrets, stunning, slowing, draining. Build a 
and 
its gg.
Q: Nasus W: Sion E: Zac R: Tryndamere passive: Volibear.
Here is a raidboss, fuckloads of damage from nasus q, great mobility, and practically unkillable even if you five man focus him. only weakness, he needs to afk farm for the first 20 minutes of game, after that he is un-matchable.
Passive: 
Q: 
W: 
E:
R: 
By using Gatling Gun to reduce armor, your other attacks can deal tons of damage. Draw a Bead originally increases the range of basic attacks, Explosive Charge, and Buster Shot. Since those two abilities are offensive abilities, Draw a Bead may also increase the range of Gatling Gun, Bio-Arcane Barrage, and Parrrley. If the enemy tries to get out of range, you can use Bio-Arcane Barrage with the Draw a Bead buff or use Super Mega Death Rocket to finish off the target.
This guy is suppose to have a similar appearance to but instead of piloting a slow helicopter, he pilots a fighter class aircraft.
Twitch Passive Q: Fiora's E (Attack Speed w/ refresh on Champ death / Assist) W: Nidalee's Spear E: Pantheon's E (Blade attack + Passive Crit Chance on characters lower than 30?%) R: Amumu's Ult
Passive of
Q of 
W of 
E of 
R of 
Build 
and you are Fast and Furious
passive: aatrox's q: sona's heal w: soraka's q e: aatrox's w r: zilean's
fuck dying, I'm never doing that
