New Champion suggestion!
My suggestion is another Demi-god(between the God of Wind), we already have plenty such as Volibear and Ornn so it won't be an alien concept. The champion will mainly be a jungle main. But instead of damage, the champ will be more utility so maybe it could also become a sup.
Her passive will be "Change of Heart" where at skill level level 3, she will be given a chance to change her skill (for that appropriate skill).
Her Q will be a hook that starts out like Amumu's(AP) but at level 3, she can change her hook to a pulling hook (AD) with shorter range and silence upon impact.
Her W will start out as a barrier that bursts on depleting (AD), her damage with the barrier burst will depend on how the long the shield on (the longer, the greater the damage). However, at level 3, she can change it to where she throws the barrier at an area where enemies hit will be slowed.
Her E will be an additional damage on her next autoattack(AD and AP), while at level 3 she can change it to a jump that deals less damage when targetting enemy champions but could also be used as an escape mechanism to jump to wards or friendly champs. Her Ult will start out as a cone of wind in front of the champion that damages and slows the enemy champs in the cone. The champion can move while the cone is active and her last blast of wind will make the champions in the cone "Brittle" which Riot introduced with Ornn as dealing percentage damage(AP). At ult lvl 3, She will channel the power into her body instead and allow increased health, lifesteal, and cooldown with a circle of dry air around her with will cause champs that are longer than 4 seconds in the circle to become brittle(circle damage will be AD).
I envisioned this champ (I think I'll name her Ingrena of the Desert Wind) as a nomadic denizen of Shurima who helped the first emperors of Shurima build the city walls to defend from the Creatures of the Void but was betrayed by Renekton as she devised the coffin within which Xerath is now trapped in. Barely managing to tell Azir of the betrayal, Azir rushes towards Xerath's holding cell with the coffin that had to be rushed due to the circumstances. With Renekton on the chase, Nasus goes to stall Renekton (where the whole feud began since Renekton's taunt to Nasus is "I will show you the meaning of butchery Brother" while Nasus' taunt to Renekton is "Rage burned away everything all that was good in you Brother") and Azir succeeds in sealing in Xerath(However since the coffin was rushed, it wasn't perfected and Xerath managed to escape to the Xerath we know today). Ingrena wounded by Renekton, fell asleep to recover. Time passed and when she awoke again, Shurima was in ruins. Seeking answers, she learned that her former allies and enemies are in the Rift and came to find Renekton, Azir, Sivir, Nasus, and seek knowledge of the events that unfolded while she was asleep.
Yah I know the Lore isn't that long or detailed but I think it can tie into the Shurima story pretty well and besides, I'm not payed by RITO to devise good Lore. They have people there who proffesionally do it and I'm confident that they'll make it better if they choose to use my suggestion.