Net, The Acrobat
https://s-media-cache-ak0.pinimg.com/736x/42/aa/45/42aa453fcea6f66df86fd17bc08cdfe8.jpg
(I do not take credit for the images in this post)
With the new movement system introduced with 
I had this idea for a champion using that movement style but changed slightly.
First and foremost, the character would look like something similar to the picture above or maybe something like a tron character. Like, if they made Pulsefire Ezreal a stand-alone champion.
His fighting style would be with two blades with a "pulsefire" theme similar to these:
http://www.polyvore.com/cgi/img-thing?.out=jpg&size=l&tid=25855972
And to make it even more fun! This champion is a roller blader :). Similar to taliyah Net will seem to glide across the rift.
Now for the fun part! The Abilities :D
> [Passive] Roller Blades
- Movement speed rises constantly when traveling in a straight direction (capping at + 10%), when turning however, Movment speed slowly returns back to base movement speed (345).
- Movement is constant, once a direction has been selected, you will continue in that direction until you change direction or hit a wall (In which case movement stops until changing direction)
- Movement remains constant during auto attacks
- If stunned, slowed, rooted, or displaced by an enemy, his movement is reset
> [Q] Grapple Cost: 50 Mana Range: 500 Cooldown: 14/13/12/11/10 Line-Skillshot Usable on ALL champions, minions, monsters, and terrain. (This includes both enemy and ally) Net fires a grapple from his wristband grabbing onto whatever he can to pull himself towards it. Grapple deals 80/100/120/140/160 (+ 50% AD)
> [W] Flip-a-roo Cost: 50/60/80/90/100 Mana Range: 125 Cooldown: 6/5/4/3/2 Point and Click Net flips right over an enemy champion striking from above dealing 25/50/75/100/125 (+ 80% AD) (Depending on direction of the flip, this may or may not affect movement speed. If you flipped in the direction of your direction of travel, your movement speed will be unaffected. If you change directions entirely, your movement speed will be reset back to standard movement speed.)
> [E]
Slash n' Dash
Cost: 50/60/70/80/100 Mana
Range: 200
Cooldown: 16/13/11/9/6
Line-Skillshot
Net dashes at extreme speed in a target direction. His
next auto attack will attack twice (Much like 
's passive,
except this is a melee champion)
> [R] Max Speed Cost: 100/120/140 Mana Cooldown: 125/110/90 Click and Drag Net charges his inner strength for 2 seconds. During this time, Net cannot move and the user draws his path. (Range: 0-1200 depending on how much you draw, the beginning of the drawing must start withing 200 range of the champion as shown by a ability marker)
After Charging, Net instantly completes the line drawn by the player dealing 200/300/400 (+200% AD) to all champions he passes through.
If stunned or displaced, Net stops charging and his cooldown is reset to 20 seconds.
If slowed, Net completes his path, but has to charge an extra second and his cooldown is not reset
As you can see, Net is a highly mobile champion with high damage but no
cc at all. Much like 
he deals high damage but has know way
(other than mobility) to protect himself. His ult is easily stopped, but if it isn't,
he deals insane damage.
He has a weak laning phase as he has no way to harass without getting close and personal. Even though his W cooldown is short, Early game he will have a hard time with mana costs. If you think the mana costs are too high, look at Maser Yi's Q, it is almost identical (I made it a little cheaper because Net's ability is not AOE).
Let me know what you think so I can tweak it. He's highly mobile but with lots of counter-play so please don't just say he's too mobile...
I know his passive is strong, but it is also very difficult to use. Those who practice will seem insane with it, those who don't will be stumbling in their skates the entire game lol!