Pyro

The Pyro is a class who wields a Flamethrower as its main weapon. Along with the ability to inflict burn damage and a relatively high damage output, the Pyro also has the airblast mechanic, which can neutralize an enemy's uber with ease, reflect projectiles like rockets and arrows, and extinguish burning team mates.

6v6

Main Article: Pyro (6v6)

In 6v6, the Pyro is considered an offclass. Most commonly run when the defending team has über disadvantage while defending last, the Pyro's job is to neutralize the enemy team's über through the use of the airblast mechanic along with compression blasting away spam from the Soldier and Demo.

Highlander

Main Article: Pyro (Highlander)

In Highlander, the Pyro is considered a support class. The Pyro's main job in Highlander is to protect the Medic. It also has the jobs of displacing and neutralizing enemy ubers, spychecking to neutralize the enemy Spy, protecting its team's sentry gun by deflecting projectiles, and providing flank support when required.

Primary

Flame Thrower		The Flamethrower provides better upfront damage than the Degreaser as well as possessing a relatively cheap airblast in comparison to the Backburner and, although by no means a bad weapon, lacks either the ambushing potential from the Backburner as well as the weapon switching bonus of the Degreaser, which can often be invaluable. Since either of the allowed alternatives have an offensive focus (trough different means) that means the stock Flamethrower will generally be used with a more passive play-style in mind, and often without tangible upsides in relation to the alternatives.
ESEA 6s legal?	Yes
UGC HL legal?	Yes
ETF2L 6s legal?	Yes
ETF2L HL legal?	Yes

Backburner		The Backburner is a weapon made with ambushing and flanking in mind and is rarely used in 6's. Since the Pyro generally has responsibilities to either the Medic or the Engineer in Highlander, it requires a significant change to the team's overall strategy to be used effectively and is therefore rarely used in that format as well. The Backburner's unique ability allows it to critically hit an enemy from behind (approximately 180 degrees) allowing the Pyro to quickly kill an unaware opponent. This comes at the price of diminished support capabilities since the Pyro will only be able to use four airblasts with full ammunition and this greatly hinders the most powerful support tools in the Pyro's arsenal.
ESEA 6s legal?	Yes
UGC HL legal?	Yes
ETF2L 6s legal?	No
ETF2L HL legal?	Yes

Degreaser		The Degreaser is the most widely used flame thrower in competitive. The weapon provides the Pyro with faster weapon switching which makes using weapon combos (such as the Flare Gun or the Axtinguisher ) far easier and allows the Pyro to handle combat situations that would otherwise be far more difficult to handle. The Degreaser's downsides come from the weapon's reduced damage upfront and weakened afterburn in relation to the stock flamethrower. This rarely affects the Pyro, still, given that the class' objectives in most competitive scenarios are to either stall the enemy or support his own team rather than actively getting kills.
ESEA 6s legal?	Yes
UGC HL legal?	Yes
ETF2L 6s legal?	No
ETF2L HL legal?	Yes

Phlogistinator		The Phlogistinator is banned is most competitive TF2 formats. It is also at a significant disadvantage to other pyro weapons, because it means that the pyro is unable to airblast, one the classes's key strengths in highlander and 6v6.
ESEA 6s legal?	No
UGC HL legal?	No
ETF2L 6s legal?	No
ETF2L HL legal?	No

Rainblower		The Rainblower is a reskin of the stock flame thrower, which was released during the Pyromania update. When it is equipped the wearer enters the Pyroland view.
ESEA 6s legal?	No
UGC HL legal?	Yes
ETF2L 6s legal?	No
ETF2L HL legal?	Yes

Secondary

Shotgun		The Shotgun is a default Pyro weapon. It is just like the Soldier, Engineer, and Heavy shotgun. It has 6 ammo in it's clip, and it's a hitscanning secondary. It's true strengths are highlighted when the pyro stays close to the combo, allowing for long range damage output.
ESEA 6s legal?	Yes
UGC HL legal?	Yes
ETF2L 6s legal?	Yes
ETF2L HL legal?	Yes

Flare Gun		The Flaregun is the second most used secondary in competitive next to the shotgun. The Flaregun does 90 damage on normal to burning enemies, and 30 damage to non burning enemies.
ESEA 6s legal?	Yes
UGC HL legal?	Yes
ETF2L 6s legal?	No
ETF2L HL legal?	Yes

Detonator
ESEA 6s legal?	Yes
UGC HL legal?	Yes
ETF2L 6s legal?	No
ETF2L HL legal?	Yes

Reserve Shooter
ESEA 6s legal?	No
UGC HL legal?	Yes
ETF2L 6s legal?	No
ETF2L HL legal?	Yes

Manmelter
ESEA 6s legal?	Yes
UGC HL legal?	Yes
ETF2L 6s legal?	No
ETF2L HL legal?	Yes

Scorch Shot
ESEA 6s legal?	Yes
UGC HL legal?	Yes
ETF2L 6s legal?	No
ETF2L HL legal?	Yes

Melee

Back Scratcher
ESEA 6s legal?	Yes
UGC HL legal?	Yes
ETF2L 6s legal?	No
ETF2L HL legal?	Yes

Postal Pummeler
ESEA 6s legal?	Yes
UGC HL legal?	Yes
ETF2L 6s legal?	No
ETF2L HL legal?	Yes

Third Degree
ESEA 6s legal?	Yes
UGC HL legal?	Yes
ETF2L 6s legal?	No
ETF2L HL legal?	Yes

Fire Axe
ESEA 6s legal?	Yes
UGC HL legal?	Yes
ETF2L 6s legal?	Yes
ETF2L HL legal?	Yes

Axtinguisher
ESEA 6s legal?	Yes
UGC HL legal?	Yes
ETF2L 6s legal?	No
ETF2L HL legal?	Yes

Lollichop
ESEA 6s legal?	No
UGC HL legal?	Yes
ETF2L 6s legal?	No
ETF2L HL legal?	Yes

Sharpened Volcano Fragment
ESEA 6s legal?	Yes
UGC HL legal?	Yes
ETF2L 6s legal?	No
ETF2L HL legal?	Yes

Maul
ESEA 6s legal?	Yes
UGC HL legal?	Yes
ETF2L 6s legal?	No
ETF2L HL legal?	Yes

Homewrecker
ESEA 6s legal?	Yes
UGC HL legal?	Yes
ETF2L 6s legal?	No
ETF2L HL legal?	Yes

Neon Annihilator
ESEA 6s legal?	Yes
UGC HL legal?	Yes
ETF2L 6s legal?	No
ETF2L HL legal?	Yes