Oni, the Demon Ward

Okay, this is my first post on here, and this idea is not even close to being fully realized (I don't have cooldowns, %s, anything like that figured out yet). But here is an idea I had for a support/tank champion.

passive: Wide Swing-aa deals half damage to all surrounding enemies. Q: Oni Fireball-launches a ball of fire that explodes on contact with the first unit it reaches. Allies in range get a fire cloak for three seconds that deals damage. W: Oni Rage-increase as and ms by X% for 3 seconds, causing a shockwave when it runs out. E: "Protect Friend"-for three seconds, all damage that would be dealt to an ally champion gets dealt to Oni. His next basic attack deals that damage + AP and heals him for half of the damage. R: Hell-upon death, Oni walls in all nearby enemy units dealing true damage and stunning them. Allies in range receive a shield equal to X% of Oni's max health. shield doesn't decay. Lore: Oni was summoned from another world to protect a village of marauders. After failing in this mission, and upon the death of his summoner, he began to wander Runeterra. When others would attack, he would defend himself, but those that were kind to him he called "friend" and protected furiously. In particular, he grew fond of the Half-Dragon, Shyvanna. He met the Demacian while wandering through a village. The villagers reacted with fear, but she looked past his frightening demeanor and spoke to him with kindness. At her suggestion, he joined the League of Legends, to find and protect more "friends." "Protect... Friends... Must... Protect..."-Oni, when asked why he exists. Tips: build AOE damage items and hp. play aggressive, but don't stray from your adc. don't get too close. his abilities can be avoided if you play smart. Is friends with Shyvana , Galio , Annie . Enemies with Brand , Zed , Veigar .