[Champ Concept] Trigger, the Mad Gunman
I'm not wasting time with lore. (I'll figure out something later...)
(NOTE: This name has nothing to do with the Triggered meme. Just thought I would say that.) Trigger is a mobile ADC possible hypercarry. He has unique short-range abilities that change as you hold down the keys (you'll see). If you keep your distance, Trigger isn't a huge threat. But never get caught out with him on your tail, or it's gg as his ult kills you faster than a nuke.
Primary Role: Marksman
Items:

Secondary Role: Fighter
Items:

> STATS (Gain per level) Health: 560 - 1869 (+77) Mana: 250 - 913 (+39) Attack Damage: 54 - 105 (+3) Armor: 25 - 69 (+2.6) Magic Resist: 30 (+0) Attack Speed: 0.65 - 1.12 (+4.3%) Movement Speed: 340 Attack Range: 500
>Passive: Momentum Trigger's total attack speed (base + bonus) is increased by 8 - 25% (+4/4.5/5/5.5/6/6.5/7% AD). His cap is also increased by this amount, up to 4.00. His Critical Strike damage is reduced by this amount, and all %HP effects not directly in his abilities are reduced by 60%.
>Q: Bull's-Eye
>A medium-range, very narrow skillshot that deals **30/50/70/90/110 (+40/50/60/70/80% bonus AD) ** physical damage and gives a stack of Bull's-Eye for 4 seconds. Enemies hit with basic attacks will take 0.5% (+1.2% per 100 AD) of their missing health as true damage per stack, disabled on targets less than 15% health. Bull's-Eye can have up to 5/5/6/6/7 charges stored at once, and each charge can be increased in range by holding the Q key for up to 3 seconds. (An indicator shows for charging longer than 1 second.)
>Range: 600 - 1400/1600/1800/2000/2200 Skillshot Width: 50 Mana Cost: 10/15/20/25/30 Cooldown: 4/3.5/3/2.5/2 seconds
>W: Overdrive
>Passive: Gain 3/3.5/4/4.5/5% movement speed per attack when attacking the same unit multiple times, up to a maximum of 30/35/40/45/50%. Active: Gain** 60/70/80/90/100% Movement speed**, decaying to 70% of that amount over 3 seconds. While toggled, you cannot attack or use abilities except W. After recasting, you will remain unable to attack for 2 seconds. On cooldown, the passive is disabled.
>Mana per Second: 30 + 3% of maximum Mana per second Cooldown: 14 seconds
>E: Flashbang
>Hold to increase the range and radius, release to throw. A long-range grenade that **blinds all enemies hit for 2 seconds. **Enemies who are hit near the center are also **stunned for 1 - 2 seconds. ** >Range: 10 - 1500 (0 - 2 seconds) Radius: 200 - 600 (0 - 2 seconds) Mana: 60/75/90/105/120 Cooldown: 20/19/18/17/16 seconds
>R: Trigger Happy
>Fires a narrow stream of bullets in a line in front of him for 2/2.5/3 seconds, dealing between** 100/200/300 (+200% Bonus AD) and 200/400/600 (+325% Bonus AD)** damage per second in quarter-second increments, based on how close to Trigger the enemy is. The stream will shred 5% of the enemy's armor per damage tick (maximum 40/50/60%) for 5 seconds.
>Range: 600/800/900 Shot Width: 150 Mana: 120 Cooldown: 110/100/90 seconds
Let me know what you think!