New Champ Idea: GLITCH
Idea I had for a new champ, lemme know what you think! Keep in mind without the ability to test these skills, I can't really predict how balanced he would be :-p
His name would be Glitch! The Error in the System, an AP carry type who specializes in turning the enemy's own strengths against them.
Passive would be almost like Eve's passive, in that he would be perpetually semi-stealthed, but would become visibile for .1 seconds every 1-1.5 seconds, giving his movement the appearance of a frame-by-frame Game and Watch style. This passive would be lost for a few seconds when dealing or taking Champion damage.
Q is Virus, a short lasting point-and-click DoT that isn't SUPER powerful, but any time an enemy afflicted with Virus would receive healing from sources other than regen, spell vamp, or lifesteal, they instead take a small amount of magic damage. If an enemy dies while afflicted with Virus, it's cooldown is refreshed.
W is Hack, a projectile blasted in a straight line (think Xerath's Arcanopulse, but if he couldn't charge it) that deals magic damage. If Hack strikes a target afflicted with Virus, the damage is significantly increased. Passively, Glitch's auto attacks against enemies that have recently been blasted by Hack deal bonus magic damage, steal 3 gold (can't steal gold from minions) and reduce Hack's cooldown by a small amount.
E is Firewall, a 1 second Braum-style shield (must aim the direction of the shield) that blocks only the first projectile which hits it, reflecting damage and 50% of any CC the projectile would have caused back to the caster.
And finally...
R is Data Corruption! Glitch channels up to 3 seconds, creating a field around him that grows larger as he channels. Once channeling ends, all enemies in the field take magic damage based on the duration of the channel and are visually impaired in the sense that everything on the screen becomes nonsensical. Some enemy champions would appear as allies, allies would look like attacking enemies, Baron/Dragon's healthbar would jump around from 1 HP to 1000 to 9999999 to 50% health and 50% purple shield, turrets could appear to be firing at 5x their normal rate, your abilities could look like they're on 99 second cooldown timers, your own health and mana bars could show negative values; this ult would just completely disorient for a few seconds whoever got caught in it, while not DIRECTLY stunning them or preventing them from moving or using abilities. Firewall would be castable while channeling.
Glitch would most likely be a fragile mid lane caster, with a short range on his Q since 1) it is point-and-click and 2) it forces Glitch to get up close and sacrifice his passive to get his full combo off, allowing for some counter-play on the enemy's part. Ideal combo would be Q into W for the amplified damage, then 2 auto attacks, with R either at the beginning to set up for an easy combo on disoriented enemies or at the end to aid in cleanup or escape. W would mark a champion just long enough to get off 2 aa's for that sweet bonus damage/cooldown, and a total of 6 gold stolen, but you could probably get 3-4 aa's off if you decided to build into attack speed. Firewall gives Glitch a little bit of safety while going on his Virus/Hack bombing runs and also allows him to block a potential interruption while channeling Data Corruption. The cooldown refresh on his Q when it kills an enemy combined with the CDR on his W when aa'ing marked champs allows Glitch to excel in teamfights where he successfully channels a good ult, since he can easily Q -> W -> aa -> aa onto disoriented champs, dealing good damage and getting the cooldowns needed to keep this combo going before the enemy's sanity returns.
I really wanted to create a champ with unique abilities that still focused around the central theme of disorienting enemies and using their own strengths against them. His passive makes his movements very unpredictable to the enemy, as he would appear to be moving sporadically in a frame-by-frame fashion. Glitch could use this to juke abilities or position himself in the middle of an enemy team for a 5 man ulti. Did someone panic-heal to try and save the team? Sucks for whoever has Virus! Did Yasuo throw a tornado to stop you? Throw it back and knock HIM up with your Firewall! No other champ has the ability to counter a heal (rather than just reducing the amount healed), no champ can steal gold, and NOBODY has a visual impairment beyond "the screen is dark," so I think Glitch could be a really unique and super fun addition to the champ pool :-)