The Minigun Champion - Marksman / Fighter.

I already know we have a minigun champion , but she doesn't focus on the idea of the minigun.

Passive: Ammunition

The resource bar is replaced with ammo, ranging from 100 - 3000 ( Based on level ) ( + 5% bonus mana ) bullets. These special bullets stop at the first enemy hit, unless you have crit chance. All attacks deal 10 - 25% ( Based on level ) of their damage, and have a ramping attack speed of 3.50. ( After 3 shots, gains max attack speed. ) Attack speed increases ammo count. ( Every 1% is 5 ammo. ) Crits increase the number of units penetrated, penetrating 1 more unit per 20% crit chance.
The penetration damage is halved, but benefits from crit damage modifiers. You're grounded, silenced and disarmed for 2 - 0.75 seconds (based on level) once all ammunition is gone.

Q: Charge up.

Passive: Increase ammo count by 5/25/45/65/85. Active: Hold down Q to face one direction, and shoot at 5.00 attack speed. However, this triples bullet usage and costs 5 ammo per second.

W: Grenade.

Throw a grenade, setting off after 1.5 seconds. Deals physical damage based on enemy current health. ( Think reverse missing health. )

E: Sprint.

Ghost yourself, gaining 20/30/40/50/60% movement speed and disarming yourself for 3 seconds. W detonates instantly while affected by this. Reactivate to cancel.

R: Pilot.

Root yourself onto a teammate, and rapidly shoot at 8.00 attack speed in a skillshot line. All bullet damage is reduced by 75/60/45% and quads/triples/doubles bullet usage. Hop off once all bullets have been used.

Ideas: This champion would want to abuse on-hit effects, and disables themselves a lot. These items would be pretty core.

I should also add this champion is slower than Alistar.