Patricia, the Noxian Impalor
Hi, I just wanted to share my idea for a champion I was pretty busy with since last year's summer, when I got the initial idea for her. I apologize for my absolutely not perfect english, it's not my native language. :) I hope you are going to like her, I sure accept your opinions! I did not think about her base stats and growths per level, because I think it's more like Riot's balance/champion team's thing. I was heavily inspired by this gorgeous model, Threnody in Velvet, be sure to check her out, Patricia's visuals should be based on her: https://www.facebook.com/threnodyinvelvet/?fref=ts
Lore: As I know, not many people are interested in this, so I'll just drop short version of her lore.
Patricia is a favourite of Noxian higher class, comming out of very honored family, she proved her talent in Noxian Arena. She is close friend with Draven (whom she never fought - and from there come rumors about their dating) and also with the clan DuCoteu, especially with Cassiopeia (another dating rumors), but that's not all - Patricia has many friends in other cities too, even in Demacia. While being a really good diplomat, she is also great stealthy assassin, which helps her with gaining informations even from those who don't want to give them willingly - informations that help her and her allies to bloom once more...
Type: Assassin/Mage AA range: short, but NOT melee
Abilities:
Passive The Noxian Impalor: Patricia starts with an iron pale. She stores another pale every level.
Q Resonating waves: All active pales resonate, dealing damage and slowing enemies in the range.
All active pales (including W) resonate, dealing 25/50/75/100/125 (+0.2 AP) magic damage and slowing enemies in the range by 40%. Cooldown: 12/11/10/9/8 Cost: 65 mana
W Thorny Shroud: Toggle On: Patricia sorrounds herself with pales, which are rotating around her and dealing damage every second to nearby enemies.
Toggle On: Patricia sorrounds herself with up to 3/4/5/6/7 pales (depending on actual amount of stored pales), which are rotating around her and dealing 30 (+0.1 AP) magic damage for every pale in the shroud every second to nearby enemies. Damage decreases every second by 20% (40% minimum), but can be reseted by walking out and in the range again. Toggle Off: All pales from the shroud get stored again. Cooldown: 5/4/4/3/3 Cost: 20 mana per second; up to 3/4/5/6/7 pales
E Impaling Iron: Patricia fires a pale to a target location, damaging all enemies in the line. Pale then remains in the location for 36 seconds, then gets stored again. Patricia can click on the pale to dash to it and store it.
Patricia fires a fast-traveling pale to a target location, dealing 75/110/145/170/205 (+0.7 AP) magic damage. Pale then remains in the location for 36 seconds, then gets stored again. 0.25 seconds after the pale lands can Patricia click on the pale to dash to it and store it (this effect has no cooldown). Cooldown: 10/9/8/7/6 Cost: 60 mana; 1 pale
R Iron Carnation: Patricia fires pales in a circle around her. Every pale acts the same way as Impaling Iron.
Patricia fires 5/6/7 pales in a circle around her. Every pale acts the same way as Impaling Iron. Cooldown: 120/110/100 Cost: 100 mana; 5/6/7 pales
Commentary:
So this is Patricia, I'm glad you read up to here, thank you. If you are still trying to realise how the heck would her combo work, here I give you some hints, althought I believe her kit has many combos doable and somewhat high skill cap.
Poke: E, Q, W, E (dash) E, Q, AA
These combos both proc TLD easily.
All in (one target): E, W, E (dash), Q, kiting and procing W's first hit E, W, E (dash), [Q], R, [Q], R (dashes)
Dashes from Iron Carnation help you with procing W's first hit.
All in (teamfight): E, E (dash), R, Q, W, [Zhonya's Hourglass]
Provides large AoE slow for your allies and with Zhonya situational slow and damage.
Don't forget, that your ult provides also powerful escape mechanic!
While I just can't imagine true length of a LoL unit, I'll try to describe ranges of Patricia's abilities by using already existing spells:
Q: Amumu's Despair (W)
W: 1.5-2 ranges od Sunfire Cape's passive
E: Ahri's Orb of Deception (Q)
R: Morgana's Soul Shackles (R) 
I'm sure everyone should be by now able to imagine Patricia's build, but for those who don't:
Sorcerers boots/Ionian boots of lucidity
Rod of Ages
Abyssal Scepter
Rabadon's Deathcap
Zhonya's Hourglass
Morellonomicon
and many more...
So this is it, I accept all suggestions and opinions, don't hesitate to comment! :)