[Champion Concept] - Trepsichore, the Grace in Movement
Terpsichore (tear-psi-KOR-ee), the Grace of Movement https://scontent-lga3-1.xx.fbcdn.net/hphotos-xft1/v/t35.0-12/12545937_1040393502668750_1733695964_o.jpg?oh=84f28d04f62a408f5f801b14ee8f3c0d&oe=569D4FEC (I do not own the actual art of this picture, but this is the concept I am going for with Terpsichore)
Description: Terpsichore is a melee assassin/Mage who uses her knowledge of dance in combat. Terpischore's auto attacks aren't of her fighting necessarily but attacking her enemies through the movement of her legs. So for example, high kicks and low kicks can be a form of her auto attacks and even grand battements can be one. The name Terpsichore originates from Greek Mythology. Terpsichore was one of the nine muses and the goddess of dance and chorus.
Champion Select Quote "Witness true passion..."
Abilities:
Passive - Petit/Grand Battement Zone Every on hit ability cast by Terpsichore will have an AOE knock back which effects all enemy units (minions, shrooms, Heimerdinger's turrets, etc.) in Petit Battement form. Every 5 basic attacks will empower Terpsichore making her achieve Grand Battement which lasts for 7 seconds and knocks back all enemy units including enemy champions.
Q - A La Seconde - 15/12/9/7/5 second CD Casting this ability will empower Terpsichore's next 3 basic attacks attacking her enemies with a la seconde turns dealing 30/70/100/120/150 magic damage. With each turn she lands, the magic damage increases (2 A La Seconde basic attacks will multiply the damage by 2, three turns will multiply it by 3) and the final turn will land a snare on her target.
Petit/Grand Battement Zone: The interaction with her Q and the passive will only proc on the last basic attack of A La Seconde.
W - Grand Jeté - 7/6/5/4/3 second CD Terpsichore leaps to a target location damaging all nearby enemies wherever she lands in an AOE zone dealing 40/80/120/180/200 magic damage.
Petit/Grand Battement Zone: Terpsichore's passive will proc on her W wherever she lands.
E - White Swan - 25/22/20/18/15 second CD Passive: Gaining this ability will spawn wings on Terpsichore. Every basic attack and ability will heal Terpsichore for 2%/4%/6%/8%/10% of the damage dealt.
Active: Terpsichore detaches herself from the wings removing all soft CC on her.
White Swan's passive will no longer have effect if the active is currently in use. White Swan's passive will only work if Terpsichore still has her wings.
R - Unity in Motion - 120/100/80 second CD Terpsichore targets an enemy champion. Terpsichore will then spawn 5 forms of herself surrounding the enemy champion and suppressing them for 3.5 seconds. During the duration, Terpsichore can cast any on hit ability (Q or W) and it will deal the same amount of damage times 5. After the duration, Terpsichore has 3 seconds to recast this ability and switch positions with any one of her other 5 forms. If the duration runs out, the other 5 forms will disappear and Terpsichore will be left in the same place she started in. This ability can be interrupted by CC if casted on the correct form of Terpsichore.
Lore: Terpsichore was born in Ionia to a family of performers. All of her family were very inclined in the ways of theater, but there was something special about Terpsichore. At the age of 2, Terpsichore was able to demonstrate a high level of flexibility at such a young age. By the time she was 10, Terpsichore was already performing around Runeterra. Even though Noxus and Demacia were two different nations, Terpsichore found that even dance can bring a few opposites together. People were able to bond over the beauty they saw in Terpsichore's movement and spirit.
One day during a performance in Noxus, Terpsichore was performing one of her favorite pieces, Swan Lake. She displayed a beautiful interpretation of the dance being the lead role, the White Swan. As she was preparing to leave with the rest of the dancers, she heard a clink. She jumped but ignored it. Staring into the mirror, she saw two figures moving closer and closer towards her. It was the figure of a woman and a man. The man took Terpsichore and tied her to a pole backstage. With a shadowy finish, he passed the job over to his friend, the woman. Terpsichore looking at her in fear wondered what she was going to do. This woman used the powers of her darkness to disable the legs of Terpsichore. She was paralyzed. They both left but the man turned to say "Do not try to put Ionia between the issues of Noxus and Demacia". Terpsichore passed out and woke up in a care room back in Ionia. The doctors didn't know how to explain the bad news to her. They told her that her feet had become brittle and she can never dance again. Dancing will just worsen her condition. Confined to a wheelchair, Terpsichore cried days upon weeks. One day, a friend of hers,
, brought her to the Lotus Garden to talk. Terpsichore asked if she can be left alone, Ahri did so. Staring down at the water, Terpsichore knows she cannot walk. She thinks, "What would happen if I fell in there?" Terpsichore cries continuously but in her mind she thinks it's okay. She whispers, "I'm okay". Terpsichore thrusts herself into the water, but in the process, the wings of the White Swan spawned on her as if it was almost shot into her. The Swans of the Lake circle around her feet glowing in a white, angelic light. Terpsichore looks up and hears the voice of a man, "That piece..... you performed it perfectly". Terpsichore, in amazement of what happened, gets up and runs to Ahri. Ahri crying says, "You're okay". "I'm okay", Terpsichore replies.
After her restoration physically and spiritually, Terpsichore joins the League of Legends to revel in her dancing ability and put to use the energy she's been holding in for all the time she's been injured (Approx. 2 years).
Allies:
Since I can't post his icon, Jhin.
Rivals:

Possible Combos: An easy 1 on 1 fight with Terpsichore can go for a dash in with Grand Jeté, ult the enemy champion with Unity in Motion, use the combination of A La Seconde with her ult, recast to switch to a different form, and dash away with Grand Jeté.
In a team fight, you definitely want to try to engage where the enemy cannot see you (preferably from the back of them). Focus their squishy carries with Unity in Motion and use Grand Jeté for the additional damage, finish them off with A La Seconde and leap away with Grand Jeté once again. Block any incoming CC with White Swan.
Works Well With:
: Focusing one champion with Unity in Motion is one thing, but having an AOE heal on top of it is another. Engage on an enemy carry with Unity in Motion, and have Fiora ult the same target. Easily, you both can obliterate the target and the heal will be a major asset for the rest of your team.
: In the scenario, Terpsichore is low in health when she ults, you can easily complete your ultimate duration with the aid of Lamb's Respite. Die free zone!
: With Leona's great CC, you can easily lock down a target in order for Trepsichore to get close enough if an enemy is too fed. Leona is basically the sponge Terpischore needs in order for a successful engage.
Not Good Against:
: An AOE ult like Fiddlesticks can easily wipe out ALL of Terpsichore's forms before she can even attack during Unity in Motion.
: The best way to counter a huge all in champion is to disengage them. Poppy is exactly what you need to protect your carries and keep Trepsichore FAR away from the rest of your team.
: Like Fiddlesticks, Zyra has an AOE ult, but her ult is also a cc ability. The damage won't interrupt Trepsichore, but with a huge knock up like that, it will completely cancel Unity in Motion and all you need to worry about is properly positioning your ultimate.
Thanks for reading guys! (That's saying if you did) I really like to make up champions in my head and especially since I had a background in dance, I would really like to see a champion who's concept revolves completely around dance.