Spoor - Pyro's primary
The airblast detection box is centered around the pyro, regardless of the vector. And the airblast will always force people sideways, no vertical motion is gained. Meaning wherever you look at doesn't matter, the direction of the reflected projectiles are relative to the pyro's position. Reflected projectiles always fly to the opposite direction relative to the pyro.
In the first person view, the weapon doesn't produce the compressed air FX. From third person view, the tank (backpack) is responsible for the visual effect. Indicating it's the air tank releasing the gas. -50% max fuel, 100 total. Resulting in a higher airblast cost.

"Center of the earth" "Dynamo" "Raven field" "Devourall" The name choices.

Suck up all - Pyro's primary
The airblast detection box is generated behind Pyro. The frontal area covers up the entire body of the pyro. If the enemy is just infront of the pyro, it allows him to airblast the opponent. Just like the normal airblast detecting projectiles slightly behind him.
Make the airblasted projectiles able to directly hit the pyro. The usage is to allow him airblast-jump more easily. It could be used for slamming the enemies to the ground for fall-damage.

Synthetic Love - Medic primary (or plastic love)
Every 100% uber will store "doll". The doll is how many times you can rebirth without going to the spawn. After the death, the coordinate is stored. You start from full health after 5 seconds. The old corpse won't be removed. The player stares at the place the med died for 5 seconds, then the player regains the control.

-50% max ammo capacity for both primary and secondary for Diamond shaker

Agriculture - Medigun
If the one you are healing is damaged, the damage is ignored up until 90. The damage ignored charges the uber, the rent is automatically payed after reaching the 100% charge. If you press m2 and activate the alt(uber), the medic is slowly damaged over time. If you just wait until 100% to automatically pay the rent, the damage is instant. You don't want to build up the uber, because the uber must be consumed. 90 damages absorbed by the gun will charge the weapon to 100%, the damage dealt to the medic from the uber is 90 maximum. Usually, attackers don't want the medic to hurt, so they become a meat shield. But this weapon allows medic to get hurt instead of someone else. But the timing you get damaged can be decided wisely. By ignoring the damage, the patient you are healing won't get damaged completely. But if the damage is over 90 in a singe hit. The exceeding damage will still affect the patient.

Standby Me - Medic's melee
If you are healing someone and the one you are healing is teleported, you get to the location together at the same time.

Laspidool - Medic's melee
Places a mannhole, When the medic respawns, the medic is teleported the location instantly. It's one time use. When the team doesn't have a tele, it should be a good way to send the medic to the frontline quick. But it can be camped pretty easilly.

Nobody has to credit me but please be interested with the ideas above, I really like the medic's "Hyde"n personality medigun, I really enjoy reading other's ideas.
Playing the medic is stressful, and being able to revenge them or being able to fight like he is the one getting ubered is very cool.
And I don't mind how my ideas are integrated in the weapons, it's fine mixing ideas as long as others are okay with that.
Please use my ideas, segment the bits of the weapon ideas and use it for different weapons. It might work, it's cool. Just because I listed weapons with too much special effects shouldn't restrict the use of the ideas, any of them. It's there to inspire the actual developers capable of making the ideas functional. Short story, I'm happy if it's confirmed that the in-game weapons use a bit of my ideas.

Concussion - Spy's disguise kit
Disguise yourself as the target enemy on your crosshair instantly, without smokes and noises.

It doesn't have to be this old idea of mine, but I came up with a disguising kit designed after a palette. For a stereotypical Frenchman.

Also, recently. I'm seeing a lot of custom weapons with seemingly familiar ideas but none of them show my user name below the stat, in which case I don't really bother. Is the stat listing the person assembled the file for the game, or is there somebody else posting the refined, adjusted stats on somewhere else. If so, I really want to seek the place. It's interesting. In all regards, what matters for me is the fact game is having the interesting weapons and me being able to see them in game, and sharing with the friends. Seeing how well the weapons turn out in the game, how it differs from my imaginary. It's all fun. Sorry for off-topic but it seems like some of the weapons are mishmash of multiple ideas originated from here. It's not like my ideas are completely original if you think about other games. I really need to know, is there a discord where people can discuss those weapons's stat, a place for someone else to finalize the concept. It must be fun talking about weapons there.