This build is OUTDATED. This means you will have to improvise to make it work. Builds are outdated when Power Pills (or Free Pills) are included in the strategy. Free Pills have been removed from the game because players stacked the pills with Power Pills Turbo.
Must Haves: Tongue Stretcher, Cheese & Garlic Mints, Steel False Teeth (SFT), Pinot Noir, Enhanced Muscle Fibers (EMF), Backstab Blade, Solar Tree, Piggy Bank, and Power Pills
Bonus Skills: Pinot Noir
Buy Order: Solar Tree > Piggy Bank > Power Pills > Stealth > EMF x1 > Electrifier x1 > EMF x1 > Electrifier x1 > Backstab Blade x2 > Tongue > Cheese & Garlic Mints x2 > Tongue Stretcher > SFT x2
This build tries to take place focus upon Leon's Slow debuff and his tongue's silencing effect to single out targets for easy kills.
The key to this strategy is through your chainsaw's EMF (Attack Speed) and Electifier (Slow Down) to help immobilize your enemy. Your final attack speed will be so overwhelming with the slowing effect that the enemy will not be able to run or jump at all, thus forcing them to either stand their ground or be foolish enough to try and run regardless. The Backstab will help increase your dmg output immensely when the opponent tries to run, and utilizing the tongue's silencing effect will help leave enemies vulnerable to aggressive attacks.
Since you'll be exposed when you mark the enemies for death, a health upgrade is a must. The best way to start off the match is to buy the Power Pill (free), followed by Piggy Bank, Solar Tree, and Stealth. If you have enough, also buy the first level of Enhanced Muscle Fiber. Next you'll want to buy one level of Electrifier (after buying the first level of EMF), followed by the Tongue Skill. Next you'll want to finish upgrading both EMF and Electrifier (in any order). Now you'll want to buy both levels of Backstab Blade to boost your DPS against foes who enjoy running. Once you have obtained those you'll want to buy the Cheese & Garlic Mints upgrade. Once you have maximized C&G Mints, buy Tongue Stretcher or SFT in any order. At this point, the only thing left is to buy Pinot Noir for further support.
This build is extremely powerful for both attacking and defending, as well as saving teammates who are being chased. You will find yourself cloaked for a very long time using this build, so with cloaked health regeneration you can be an ever present threat as you stalk your prey.
On offense you can pull enemies away from their turrets and have them silenced and slowed down, making for an easy kill. Same goes for defense, pulling them toward you and your turret and making it near impossible to escape. You'll be an important factor in almost every kill your teammates get, and they'll love you for it.