Your Last Played Champion Is Drunk...
 

And has forgotten their W and their Ultimate. Explain it to them.

Irelia

You take that magical blade thingy and hit people with it to cure all your ailments. Then you jump into the air and shoot out glowing daggers that don't really hurt people but make you feel a lot better.

Go.

Gragas.

Ummm.... just keep doing what you're doing.

Throw your barrel like your Q, only with a little more oomph.

Also, I feel special.

You throw a temper tantrum and then call your parents.

Varus:
You hurt big people lots and big people more if you shoot them lots then shoot them with a bunch of arrows at once, and you unleash a hentai rape-tentacle that molests their whole team and invites your team to join in.
Because yeah, Varus is that creepy.

Put down a genuinely terrifying Jack-In-The-Box, I promise they'll sh*t their pants with fear, trust me man. Whats next? Ultimate. Ult. I. Mate. I mate? what? *laughs* dude we shouldn't of had all that. Why am I seeing four of you?

Yell rude obscenities at people mocking them, then just dont die, because if you can't die that means you can't lose

Sona:
W: you play on your instrument and unleash green energy that hits yourself and the nearest ally.
R: You make enemies in front of you dance for your team as a pregame warmup to a fight.

Caitlyn:
W- You drop cupcake traps to catch Yordles.
R- You get naked and snipe everyone
(Gotta have a little fun ;) )

You shoot a little stream of water that heals your teammate and makes them move fast, but it doesn't bounce back to you unless it bounces to an enemy first for some reason. Then you shoot a big wave that moves at .1 mph and gets your enemies' clothes wet so they can't move as fast, but it makes your teammates move faster if they get hit by it too.

Spin in a circle and run around randomly while 3 flames go after the closest people.