Paris Montag by varkarrus

Level 1:

Schadenfreude: For every enemy hero on fire, take 7% reduced damage from all sources.

Juggernaut Plating: Health is increased by 15%. You also can hold up to 2 charges of Block.

Heat Stroke: Enemies that are next to you while Overheat is active have their attack speed reduced by 50%.

Pyromania: Damaging at least one enemy with any primary ability restores 8% of your missing health. Can only trigger once per ability.

Level 4:

Collateral Damage: Using Napalm Burst on brush causes it to set on fire after 2 seconds, providing vision, and setting enemy heroes on fire. Lasts 10 seconds.

The Melting: Abilities set minions, mercenaries, and structures on fire, dealing 130 damage over 4 seconds.

Football Tackle: If an enemy is below 25% health, Jet Booster roots them for 1 second as well.

Level 7:

Overclocked Boosters: You can press and hold E to charge Jet Booster for up to 0.5 extra seconds. Doing so increases the range by up to 50%.

Pressurized Fuel: Napalm Burst has 50% increased range.

Destructive Urges: Overheat's Flame Nova has 25% increased damage and radius

Over The Top: Overheat's CD is refreshed if she scores a takedown.

Level 10:

BBQ Boulevard

Molten Overdrive

Level 13:

Carnage: Napalm Burst fires for twice as long, but damage per tick is reduced slightly. Overall, the total damage is increased by 40%.

Explosive Personality: If she falls below 25% health, she instantly triggers Overheat, separate from it's CD.

The Juggernaut B****: Jet Booster deals 100% bonus damage, and a further 100% damage