Well, lets finish Pyro wiht his really mid melee.
So I tried to balance or better, rework them. Like Quick Draw, with many other weapons, who came to this game from their inspirer. SO let's start, again.
Let's make glove into combo weapon for agressive run-away with speed boost of 1st slap and, maybe, self-defense tactic on 2nd slap. Changes was really many, let's start with speed boost, original one have 1 second duration, which really sucks, espically with that slap-hit mechanic and smaller damage. So I added another effect and make it slower holsters, so it's can't be stange upgrade to escape sign.
Original weapon literally just upgraded stock. So let's add some bonuses to make it more intersting, like mini-crits, everyone loves that sound, isn't it. Also 100% damage to doctor is crazy, cause this doctor will now take 35 damage when you hit their patient. Can be really annoying, but expect overheal melting situation this axe worser melee.
How I suppose to stay the fire on hit gimmick, if it usuless melee weapon's mechanic ever on this class. Let's add something new to it, and I present batarang for Arsonist! Yea, there's downsides with 'hands' gimmick ( I believe funny robot weaker than motorcycle gang leader).
Neon annihilator is quite narrow in purpose, and even with gas passer combo (especially considering that the crit damage is exactly 126), its potential will still be narrow. Well, let's add the mechanics of stealing effects from enemies (gimmick with teammmates is copy, stock on arsonist can remove bad effects, but with the restoration of health so). So be careful with your banners, Troopers, otherwise they will be taken away from you from ambush and given to the enemy Brute (only him and effect duration is same as was before steal).