yeah

Here’s my suggestion for stats, perfect for what the Pyro is unmatched in; hit and runs:

+ Afterburn deals 2% of target’s current max health as damage per half second
+ Airblast is constant stream as primary fire is but at twice rate of ammo cost
- -50% damage penalty

Here’s a graph to show the first mechanic, keeping in mind that all damage in TF2 is rounded up

Current Max Health of Ignited Enemy (h) ---- Afterburn Damage per Half Second for 10 seconds

50 < h ≤ 100 ------------------------------------------- 2
100 < h ≤ 150 ------------------------------------------ 3
150 < h ≤ 200 ------------------------------------------ 4
200 < h ≤ 250 ------------------------------------------ 5
250 < h ≤ 300 ------------------------------------------ 6

STAAAAAAAAAAAAAATS

+Mini RocketJumps With AirBlast
+50 Ammo
+AfterBurn Deals 5% Slower Movement On Foe
+Silent Killer
-15% Damage
-5% Slower Wep Switch
-60% More KnockBack On Blast Damage

I say: +25% speed boost when drenched for 15 sec ( jarate, milk, water) etc
bullets extinguish teamates
-30% damage
_ 10% speed

Why the hell is this a flame thrower? It should be a soldier rocket launcher that launches two rockets at the same time. But if it must be pyro...
Make it a flamethrower that works underwater. That alone would be awesome.

+20% damage
+15% airblast cost
+15% airblast force
-10% health

The original war of the worlds :) my favourite book