It's hard to say without knowing your playstyle, but here are some suggestions:
Scout seems good.
I'd use the shotgun over the Righteous Bison because of the larger clip size.
I'd use any other melee weapon over the Volcano Fragment because if you're close enough to melee, then you're close enough to just use the flamethrower.
Can't argue with the Demo loadout.
I don't use the Brass Beast because of its speed reduction and I prefer weapons with more specific utility like the Sandvich or GoRU for non-primary.
Gunslinger + Frontier Justice is a good combination, but there are better primaries to use when you have a normal 3 stage sentry.
Good on medic.
Good except everyone will get mad at your for being a piss sniper.
I think the Spy-cicle works best with the Dead Ringer, but that's just my opinion.
My loadouts are:
Scout: Soda Popper, Bonk! Atomic Punch, Candy Cane OR Strange Shortstop, Strange Mad Milk, Holy Mackerel
Soldier: Strange Black Box, Gunboats/Mantreads, Escape Plan
Pyro: Degreaser, Reserve Shooter, Postal Pummeler OR Strange Backburner, Shotgun/Flare Gun, Back Scratcher
Demoman: Strange Grenade Launcher, Strange Scottish Resistance, Conscientious Objector OR Demopan
Heavy: Strange Minigun, Sandvich, Gloves of Running Urgently
Engineer: Strange Rescue Ranger, Short Circuit/Wrangler, Strange Jag OR Frontier Justice, any, Gunslinger
Medic: Overdose, Strange Medi Gun, Vita-Saw
Sniper: Sydney Sleeper, Darwin's Danger Shield, Bushwacka
Spy: L'Etranger, Conniver's Kunai, Dead Ringer, Red-Tape Recorder