Champion concept: Ingrid, The Ashen Witch
Ingrid is a top/mid laner with counterplay built in around her white ashes. Throughout the laning phase, the enemy laner will be forced to decide whether or not it's worth walking into her White Ashes to deny her the buff at that location.
When she was young, Ingrid was a prodigy at fire magic, and she was fascinated by the dancing flames. One day, when she was practicing a particularly high level spell, she lost control, burning down her home and family. Stricken with grief; suffering from terrible burns; and scared that she would be executed for the murder of her family, she fled, vowing to herself to never use her fire magic again.
As she grew older, she discovered something of an affinity for ashes, eventually learning ash magic, which she considers the highest form of fire magic. Now, in her old age, she seeks to teach her ash magic to anyone that will listen to an old woman's ramblings.
Passive: Ashes of the past Standing here almost reminds me of home When standing on Scattered ash gains 10% movement speed, +5-10% AP, and +5-10% MR.
Q: Burning ashes The ashes burn hotter the the flames Throws white hot ashes in target direction, if they hit an enemy deals 50-200 (+0.3 AP) damage on impact and 30-180 (+0.2 AP) over the next 3 seconds. If the ashes miss, they mark the ground underneath the endpoint as White ash If an enemy walks over White ash they are dealt 20-150 (+0.2 AP) damage over the next 3 seconds. If no one walks over White ash for 5 seconds, the ground becomes Scattered ash for the next 2 minutes.
W: Ashen shield Ingrid creates a shield of ash around her that blocks 60-200 (+0.6 AP) damage for the next 1-2 seconds. When the shield wears off, turns a small area around her into Scattered ash for the next 1 minute, area changed is doubled if the shield is destroyed before it wears off.
E: Immolate Life is but a moment away from ash. Ingrid attempts to incinerate target enemy, dealing 30-120 (+0.3 AP) damage. If Immolate kills the target enemy, turns the ground around them into White ash. Deals double damage to minions.
R: Memories of the Inferno Even ash remembers what it was like to burn Ingrid channels for 1 second and ignites all the Scattered ash within a large area around her, dealing 30-60 (+0.2-0.4 AP) damage per second to all enemies standing on Scattered ash. If Ingrid is alive after 5 seconds, the ignited ash explodes dealing 100-200 (+0.3-0.7 AP) damage to all enemies standing on Scattered ash within range. All ignited ash is consumed.
Taunts:
To enemy Brand You seem to be burning. I can fix that for you. To enemy Freljordian I fear not what the ice brings.
To enemy Annie It's like looking at a younger, stupider me.
To enemy Leona The sun burns all to ash. I burn the ashes.
To enemy Shyvana Dragonfire huh? I thought I felt a cool breeze. To enemy Maokai You'll make some lovely ash.
To enemy Sejuani of Lissandra You should surrender now. You were already having trouble with ash before I showed up
To enemy Ashe Who would trust the ashes to protect the ice?
I'll help you to look more like your namesake.
Quotes
On walking I'm hobbling as fast as I can.
On buying Hextech items Would call this a gizmo, or a doohickey?
On buying Rabadons Deathcap Now THIS is a hat.
On buying Liandry's Torment Will this make more children scream at the sight of me, or less?
On killing with her ultimate Scatter with the ashes!
Joke Trespassers will be burnt. Survivors will be incinerated.