New Champion: Gavin - The Guitarist of The Void

Okay, so I have the idea of making a new champ. This champ uses the power of his Cursed guitar's music to harm his opponents. I was hoping for him to be a Mage/support (Mid/support). Gavin's his name.

Lore - Gavin came from the quiet and small town of Kalamanda. His family being a poor family and having very little. But Gavin had one precious item. This was his guitar. Gavin saved up all the money he could scrounge from random jobs around town. He had his eye on this guitar ever since he was a kid. Even though the merchant had warned Gavin about the evilness locked inside the guitar because of the fact that it was curse, a curse from the Void. This void curse had killed the son of the merchant. Gavin had no belief in such a thing, and bought the guitar regardless of the curse. At first he felt nothing as he played it, but soon he felt the real magic start to pull him inside. It felt like pure darkness, as if the void had been in the guitar. Gavin fought it and won. Over many years he has tamed the curse, using it to his will. After Honing his new gift, he joined league. fighting in league was another childhood dream. Now Gavin is fighting just like in his childhood dreams.

Base stats -

Health: 585 (+50)

AD: 52 (+3)

Magic RS: 30

Health Regen: 2.0 (+.12)

Range: 550

Mana: 350 (+20)

Armor: 15 (+2)

Mov. Speed: 360 Mana regen: 1.3 (+.11)

Skills

Passive: Stringy! - every 6 moves Gavin strums one of his six strings. string 1 - Gavins attack slows his target by 20% for 3 seconds String 2 - Gavin wards the target for 5 seconds String 3 - Gavin does an addition 50 magic damage for his next attack String 4 - Gavin's attack stuns the target for 2 seconds. String 5 - Gavin gains 100 mana String 6 - Gavin gains 100 health

Q - Shuri-pick: Gavin throws a magical guitar pick causing 70/110/140/170/200 magic damage + 50% AP to anyone it passes through Cost:60/60/60/60/60 Cooldown:7/7/7/7/7 Range:800

W - Lullaby: Gavin plays a small melody that does 30/60/90/120/150 magic damage (+40% AP) and slows target by 20% Cost:50/70/90/110/130 Cooldown:12/11/10/9/8/7 Range:700 E - Sonic Boom! - Gavin strums all strings as loud as he can causing the target (Ally or enemy) to be flung away or towards him. Deals 10 (no scale) magic damage (+10% AP)(doesn't harm ally) Cost:100/100/100/100/100 Cooldown:15/15/15/15/15 range:300

R - Possess: Gavin uses the dark magic of his guitar and charms the target causing them to waste any spells they have available, wasting their mana and causing half the damage to them. If Gavin targets himself then a enemy he uses their spells to heal him for half the damage. Cost:150/150/150 Cooldown:130/115/100 Range:1000

Well here is all his stuff. Please if you have ANY suggestions or if I forgot anything. thx for support.