Amoline, the Shadow Witch
Well, we could always add Annie's mother, Amoline. She's a witch who's part of the "Gray Order" in the Voodoo Lands, just due south of Noxus. It's a place full of social and political outcasts, that not even the citizens of Noxus want to deal with.
Would be great to see more emphasis on smaller places like these that already have their own lore written, and have it be expanded upon. You know, instead of seeing NEW places being used or the usual 10 major zones. (Damacia, Noxus, Zaun, Piltover, Shurima, Void, Shadow Isles, Bilgewater, Freljord, Bandle City.)
My idea on how she'd be is all about her using hexes to curse enemies and take control of others. Similar to the original Tabboo character who was a witch-doctor and was scrapped during his character creation process. Immobile, heavily CC dependent, control mage theme.
Passive: Visions of the Shadows
Amoline passively taps into the shadows around her, gathering power from them while she is in brush and unseen by enemies while in the fog of war-- gaining increasing bonus % AP based on how much "Hex" she has at one time raising up to a cap of 60% bonus AP at six bars of Hex. Amoline does not use mana as a resource, but instead uses "Hex"; Hex is generated slowly over time, but doubles in speed while she is unseen by the enemy team and has a maximum of six bars. All of Amoline's abilities use bars of Hex as a resource.
Eldritch Bind Costs 1 Hex
Amoline binds one enemy unit to another allied or enemy unit. Enemies who are bound take a percentage of damage that their bound partner does in combat, and allies heal for damage taken by the enemy that is bound. If the link is broken early, enemies bound will be slowed and allies given that amount as bonus movement speed. This ability does not have a cooldown and can be used to link multiple targets to a single enemy or ally. A link lasts until one of the two units dies, a specific number of damage based on Amoline's AP/ability rank is reached, or when the two targets are out of range of one another. (IE: If Amoline has 100 AP, the cap for damage the unit can take before the binding ends is roughly 150 at rank one.) Additionally, if one of the links to a target who has more than one link to them is broken, all links are severed; the slow effect does not stack.
W: Grey Pact Costs 2 Hex
Amoline selects a target zone, enveloping that area with a curse. Any enemy units inside this zone after a 0.8 second delay will be "Cursed". Cursed units will deal 10% less damage, take 10% more damage, and be slowed for 10% per rank of this spell up to a maximum of 50% each at rank 5. Cursed lasts for 5 seconds at all ranks. Additionally, this spell deals damage to units when the effect first starts.
E: Mind Blast Costs 2 Hex
Amoline confuses enemies in a radius around her, forcing them to be taunted to their nearest ally for up to 1.6 seconds based on ability rank. Additionally, this ability deals damage to targets affected by it. (Note: Epic monsters and structures are immune to this effect)
Power Word: Death Costs 6 Hex
Amoline channels for up to 6 seconds, dealing increased damage and having a wider range of effect based on how long she channeled the ability. After the channel is finished or ended prematurely, all units in the area, friend or foe, will take extreme damage and be silenced based on the rank of the ability. This ability cannot kill allies, but it can damage them including Amoline herself. Allies will be notified with a "DANGER" ping at the center of the ability's cast zone until it is done channeling. This ability can be interrupted, but if it is interrupted after at least 3 seconds of channeling, the effect will still occur.
Champions Amoline would work well with: 
Champions Amoline would struggle against: 
Champions Amoline would work well against: 
Amoline does best when she's unexpected and unseen by her enemies, as she gains Hex faster while unseen regardless of whether she's in combat or not. This means champions who obstruct vision like Akali or Nocturn do wonders for her as allies, and champion with controllable minions like Annie and Yorick allow her to deal damage to her enemies with Eldritch Bind with ease. She does poorly against champions who have the ability to ignore or remove CC effects and chase her down, such as Master Yi, Gangplank, Kassadin. She also does poorly against champions who can force vision of her, such as Twisted Fate. Amoline works best against champions who have summons of their own, and champions who do best in groups, as she can use their allies against them.
She'd do best being played in the Jungle, Mid, or as a Support.
If I were to give her a look, I'd say something along the lines of
And yes, Baba from DBZ is judging you as you write a reply.