CHAMPION CONCEPT: Hinata, the Unmoving Guardian
Long story short, I launched a survey, and in so doing I had a sudden idea for a champion. I will now create her. ("Her" because generally, the naginata is a weapon I attribute to women. Thanks, modern naginatajutsu?)
HINATA, the Unmoving Guardian is an Ionian warrior. Serene and resolute, she holds the enemies of Ionia at bay with an unflinching resolve. Visually, I have her somewhere between a Japanese onna-bushi and an Indian look. Samurai armor under a sari, perhaps, with hair tastefully tied back out of her way. She wields a naginata - a polearm with a curved blade - and classifies as a tanky support.
Hinata uses Mana.
[PASSIVE: Unbroken Will] (Cooldown: 10s) Whenever Hinata is affected by a crowd control effect, she gains Unbroken Will, reducing the duration of future crowd control effects by 20%. If she takes another effect while Unbroken Will is in play, the effect stacks and refreshes duration. Unbroken Will can stack up to 3 times (for a 60% reduction), but after 3 seconds of not being hit with CC, all stacks are lost and the ability goes on cooldown.
Unbroken Will is applied after tenacity, reducing the CC duration as established by tenacity. For example, if tenacity is reducing a 5-second CC by 50% (to 2.5 seconds), three stacks of Unbroken Will reduces the effect by another 60% (1 second), making the final duration 1.5 seconds.
[Q: Turning Tides] (Mana: 65/60/55/50/45) (Cooldown: 12s) Hinata dashes forward a moderate distance along the path of a skillshot. When she collides with a champion, Hinata stops on the other side of them and throws the champion back to her original spot with her naginata, dealing physical damage.
[W: Wall of Steel] (Mana: 100/90/80/70/60) (Cooldown: 18s/17s/16s/15s/14s) Hinata becomes immobile for up to 4 seconds on first cast, increasing her bonus Armor and Magic Resist by 25%. Subsequent casts throw out a wide skillshot with fairly short range, dealing physical damage and stunning all enemies hit for 0.25 seconds while knocking them back to the edge of the skillshot's range. She can do this three times, with the third time ending the ability and triggering cooldown. She can also cancel by pressing any other ability key.
If Hinata uses Wall of Steel while she has three stacks of Unbroken Will, she becomes immune to crowd control for the duration.
[E: Enforced Tranquility] (Mana: 75) (Cooldown: 8s/7s/6s/5s/4s) Hinata targets an enemy within an immediate radius, dealing physical damage reducing their AD and AP by 30% for 2 seconds. A given enemy can only be affected once every 4 seconds.
If Hinata uses Enforced Tranquility while she has 3 stacks of Unbroken Will, she consumes all stacks and also Disarms the target for the duration.
This effect works on minions and jungle monsters as well, instead reducing their damage output by 10/15/20/25/30%.
[R: Tending the Garden] (Mana: 200/150/100) (Cooldown: 180s/160s/140s) Hinata stops, creating a field in a moderately sized circle around herself. She slashes after 1 second, launching enemy champions caught in the field and suspending them in the air. Fixed to the center of the circle, she then slashes each affected champion in a random order at 0.75 second intervals, dealing true damage equal to 250% of her AD. After the last hit, Hinata slams the ground with her naginata, sending out a shockwave that deals magic damage to all enemies on the ground who are now in the radius, and knocking them back to the edge of the circle. The floating champions then drop and are slowed by 20% for 2 seconds.
If Hinata uses Tending the Garden while she has 3 stacks of Unbroken Will, dropped champions also have their Armor reduced by 50% for the duration of the slow.
Hinata is uninterruptable after the initial 1 second. If she is interrupted during the initial 1 second, her Unbroken Will stacks also apply as a cooldown reduction to Tending the Garden.
While enemies are floating, they are untargetable. However, for a 0.25 second window just before they drop, they count as knocked up and can be targeted by things like Yasuo's ultimate. There would likely be some lines of shared dialogue between a Hinata and Yasuo who managed to combo their ultimates in this way.