Almost certainly worse than just the hammer

terrible

dual wielding isn't really much of a thing to begin with, because it requires a tremendous amount of skill to use the off hand as anything better than a parrying weapon
at which point a way less skilled knobhead with a big fuck-off shield negates any advantage your years of practice gave you

plus neither is an actual weapon

Hammer in the main hand like a mace. Sickle in the off hand to use like a khopesh or hook sword so you can disarm your opponent. No, this is not realistic in any way. No, I do not care.

construction and farming tools don't tend to be good weapons, as a general rule. you wouldn't farm with a pistol either

there's a reason spears and the like were the most common kind of weapon before the invention of firearms

Not good unless they're chained together. Then it'd at least be fun to watch.

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stylish as all hell, so automatically good

When you attack with your Hammer, you deal 1d4 + your attack modifier bludgeoning damage. As both weapons have the Light property, you can use your bonus action to make an attack with your off-hand Sickle for 1d4 slashing damage, but you do not add your ability modifier to the damage unless you have the Two-Weapon Fighting class feature.

The hammer is used to bonk them on the head and while they're stunned and wobbly with little stars around their heads, the sickle can be used to pick them up by the scruff of the neck and toss them into the sea.

Close combat against somebody without any armor. Especially if you're ambushing them. It be okay.

If they could see you and had a shield or a weapon with some range like a staff or spear you'd probably be in for a rough fight.

Now I kinda want to try that in Blade and Sorcery. idk if it has sickles though.

Realistically, terrible. Unless you welded the two together into a kind of polehammer with a tripping hook, and then had a hundred mates wielding the same weapons alongside you.

But I have a concept in my head that would be sick for an anime or video game where the sickle is used for light attacks/blocking, and the hammer is slung over your shoulder and used for heavy attacks. Kind of like Metal Gear Rising: Revengeance, but with crushing physics instead of slicing effects.

Idk... not terrible? Depending on how your sickle is shaped it's basically just a weird sword or knife, and if you get a hammer that's reasonably light?

I mean it wouldn't be my first choice but if I was part of a political tendency theme'd DND party I think it could work outl.

Well, I think the only practical way this works is to use a warhammer like a warhammer, with a sickle as a sidearm.

Like others said before there's not really an advantage for you to dual wield, and those two implements don't really complement one another in a way you wouldn't be served better by almost literally any other weapon combination lol. The only advantages you'd get from wielding a sickle over a dirk or something like that are already provided by the hook on your warhammer.

E: also I think it's worth pointing out that IRL warhammers look very different from the hammer and sickle hammer or fantasy BS warhammers; most are closer to polearms than the big fuck-off maul type weapons in Skyrim

A short handled sickle or a hammer would probably work better than a gun at short range, assuming the person hadn't drawn the gun yet.